{"items":[{"id":"NVI-00003930","kind":"vulnerability","title":"Symfony: ReDoS in HeaderUtils::split() Reachable Through the Cache-Control Request Header","revision":5,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-r925-mgvr-h9cc","CVE-2026-108082"],"plain_summary":"GitHub lists this reviewed advisory for symfony/http-foundation, symfony/http-foundation, symfony/http-foundation, symfony/symfony, symfony/symfony. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-069c935e98b54c1cd08ee4e37787534f"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 6.4.46 for symfony/http-foundation. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.19 for symfony/http-foundation. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.1.7 for symfony/http-foundation. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 6.4.46 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.19 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.1.7 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 5.4.54 for symfony/http-foundation. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 5.4.54 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-16T16:00:33.533Z","value":"8.7 HIGH (4.0)","meaning":"596c5446-0ce5-4ba2-aa66-48b3b757a647 severity; no combined Null risk score.","source_id":"sr-b7057b83f6f600eafb0609e9b5f3a702"},{"kind":"EPSS","as_of":"2026-11-05T12:03:04.000Z","value":"0.480%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.41595. Missing scores are unknown.","source_id":"sr-069c935e98b54c1cd08ee4e37787534f"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-27e50058df3708f6cab343725d08e630","url":"https://github.com/advisories/GHSA-r925-mgvr-h9cc","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-r925-mgvr-h9cc","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:36.327Z"},{"id":"sr-505923d10f32c0a364ad1ce4b317cdca","url":"https://github.com/advisories/GHSA-r925-mgvr-h9cc","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-r925-mgvr-h9cc","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:41.360Z"},{"id":"sr-b7057b83f6f600eafb0609e9b5f3a702","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-108082","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-108082","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-01T01:40:38.141Z"},{"id":"sr-069c935e98b54c1cd08ee4e37787534f","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-108082","publisher":"FIRST EPSS","observed_at":"2026-11-06T00:24:57.627Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 6.0.1, < 6.4.46"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 7.0.0, < 7.4.19"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 8.0.0, < 8.1.7"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 6.0.1, < 6.4.46"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 7.0.0, < 7.4.19"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 8.0.0, < 8.1.7"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 4.1.0, < 5.4.54"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 4.1.0, < 5.4.54"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 6.0.1; fixed 6.4.46"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.19"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.1.7"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 6.0.1; fixed 6.4.46"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.19"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.1.7"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 4.1.0; fixed 5.4.54"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 4.1.0; fixed 5.4.54"]}],"null_published_at":"2026-11-08T15:11:49.401Z","source_updated_at":"2026-10-27T19:01:40.000Z","source_disclosed_at":"2026-10-27T19:01:39.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:42:41.360Z"},{"id":"NVI-00003930","kind":"vulnerability","title":"Symfony: ReDoS in HeaderUtils::split() Reachable Through the Cache-Control Request Header","revision":4,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-r925-mgvr-h9cc","CVE-2026-108082"],"plain_summary":"GitHub lists this reviewed advisory for symfony/http-foundation, symfony/http-foundation, symfony/http-foundation, symfony/symfony, symfony/symfony. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-023bece7f24262998a2146d4cbb200dd"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 6.4.46 for symfony/http-foundation. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.19 for symfony/http-foundation. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.1.7 for symfony/http-foundation. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 6.4.46 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.19 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.1.7 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 5.4.54 for symfony/http-foundation. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 5.4.54 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-16T16:00:33.533Z","value":"8.7 HIGH (4.0)","meaning":"596c5446-0ce5-4ba2-aa66-48b3b757a647 severity; no combined Null risk score.","source_id":"sr-b7057b83f6f600eafb0609e9b5f3a702"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.480%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.41459. Missing scores are unknown.","source_id":"sr-023bece7f24262998a2146d4cbb200dd"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-27e50058df3708f6cab343725d08e630","url":"https://github.com/advisories/GHSA-r925-mgvr-h9cc","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-r925-mgvr-h9cc","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:36.327Z"},{"id":"sr-505923d10f32c0a364ad1ce4b317cdca","url":"https://github.com/advisories/GHSA-r925-mgvr-h9cc","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-r925-mgvr-h9cc","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:41.360Z"},{"id":"sr-b7057b83f6f600eafb0609e9b5f3a702","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-108082","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-108082","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-01T01:40:38.141Z"},{"id":"sr-023bece7f24262998a2146d4cbb200dd","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-108082","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.373Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 6.0.1, < 6.4.46"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 7.0.0, < 7.4.19"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 8.0.0, < 8.1.7"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 6.0.1, < 6.4.46"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 7.0.0, < 7.4.19"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 8.0.0, < 8.1.7"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 4.1.0, < 5.4.54"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 4.1.0, < 5.4.54"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 6.0.1; fixed 6.4.46"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.19"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.1.7"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 6.0.1; fixed 6.4.46"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.19"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.1.7"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 4.1.0; fixed 5.4.54"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 4.1.0; fixed 5.4.54"]}],"null_published_at":"2026-11-06T15:18:17.694Z","source_updated_at":"2026-10-27T19:01:40.000Z","source_disclosed_at":"2026-10-27T19:01:39.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:42:41.360Z"},{"id":"NVI-00003930","kind":"vulnerability","title":"Symfony: ReDoS in HeaderUtils::split() Reachable Through the Cache-Control Request Header","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-r925-mgvr-h9cc","CVE-2026-108082"],"plain_summary":"GitHub lists this reviewed advisory for symfony/http-foundation, symfony/http-foundation, symfony/http-foundation, symfony/symfony, symfony/symfony. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-023bece7f24262998a2146d4cbb200dd"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 6.4.46 for symfony/http-foundation. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.19 for symfony/http-foundation. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.1.7 for symfony/http-foundation. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 6.4.46 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.19 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.1.7 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 5.4.54 for symfony/http-foundation. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 5.4.54 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.480%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.41459. Missing scores are unknown.","source_id":"sr-023bece7f24262998a2146d4cbb200dd"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-27e50058df3708f6cab343725d08e630","url":"https://github.com/advisories/GHSA-r925-mgvr-h9cc","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-r925-mgvr-h9cc","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:36.327Z"},{"id":"sr-505923d10f32c0a364ad1ce4b317cdca","url":"https://github.com/advisories/GHSA-r925-mgvr-h9cc","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-r925-mgvr-h9cc","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:41.360Z"},{"id":"sr-023bece7f24262998a2146d4cbb200dd","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-108082","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.373Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 6.0.1, < 6.4.46"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 7.0.0, < 7.4.19"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 8.0.0, < 8.1.7"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 6.0.1, < 6.4.46"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 7.0.0, < 7.4.19"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 8.0.0, < 8.1.7"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 4.1.0, < 5.4.54"]},{"certainty":"source_listed","source_ids":["sr-27e50058df3708f6cab343725d08e630"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":[">= 4.1.0, < 5.4.54"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 6.0.1; fixed 6.4.46"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.19"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.1.7"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 6.0.1; fixed 6.4.46"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.19"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.1.7"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/http-foundation","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 4.1.0; fixed 5.4.54"]},{"certainty":"source_listed","source_ids":["sr-505923d10f32c0a364ad1ce4b317cdca"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`HeaderUtils::split()` parsed header values with a pattern whose token alternative also matched whitespace, followed by a `(?<!\\s)` lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. `HeaderBag` calls it for the `Cache-Control` header whenever a `Request` is built, so any application handling HTTP requests is reachable, with no authentication.\n\nA single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, `preg_match_all()` gives up at `pcre.backtrack_limit` and `split()` returns an empty array, so every directive of the header is silently dropped.\n\n### Resolution\n\nThe pattern now consumes whitespace only when more of the value follows it, so a value can no longer end on whitespace, nothing has to be given back, and every quantifier is possessive. The first release of this fix broke splitting on a whitespace separator: `HeaderUtils::split('foo bar', ' ')` returned a single value in 6.4.46 to 6.4.4","public_affected_ranges":["ECOSYSTEM: introduced 4.1.0; fixed 5.4.54"]}],"null_published_at":"2026-10-31T22:13:44.214Z","source_updated_at":"2026-10-27T19:01:40.000Z","source_disclosed_at":"2026-10-27T19:01:39.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:42:41.360Z"}],"next_cursor":null,"snapshot_revision":"42594"}