{"items":[{"id":"NVI-00006619","kind":"vulnerability","title":"Webcache Poisoning in symfony/http-kernel","revision":3,"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-q3j3-w37x-hq2q","CVE-2021-41267"],"plain_summary":"OSV carries this publisher advisory for symfony/http-kernel, symfony/symfony. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 5.3.12 for symfony/http-kernel. Confirm the publisher’s latest guidance.","source_ids":["sr-bbdb5d0680748bcd62e53fab15d391aa"],"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 5.3.12 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-bbdb5d0680748bcd62e53fab15d391aa"],"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":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-066f36466d95bc51940fdbe57846ce45"],"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}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-06-17T04:08:12.260Z","value":"4.3 MEDIUM (2.0)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-88434590ebbee197405a6c957264de63"},{"kind":"CVSS","as_of":"2026-06-17T04:08:12.260Z","value":"6.5 MEDIUM (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-88434590ebbee197405a6c957264de63"},{"kind":"EPSS","as_of":"2026-11-02T12:00:30.000Z","value":"1.280%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.7001. Missing scores are unknown.","source_id":"sr-066f36466d95bc51940fdbe57846ce45"}],"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-bbdb5d0680748bcd62e53fab15d391aa","url":"https://github.com/advisories/GHSA-q3j3-w37x-hq2q","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-q3j3-w37x-hq2q","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:30.997Z"},{"id":"sr-88434590ebbee197405a6c957264de63","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-41267","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2021-41267","publisher":"NIST National Vulnerability Database","observed_at":"2026-10-31T23:13:48.814Z"},{"id":"sr-066f36466d95bc51940fdbe57846ce45","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-2021-41267","publisher":"FIRST EPSS","observed_at":"2026-11-02T20:14:50.774Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-bbdb5d0680748bcd62e53fab15d391aa"],"technology":"symfony/http-kernel","known_exclusions":[],"conditions_summary":"Description\n-----------\n\nWhen a Symfony application is running behind a proxy or a load-balancer, you can tell Symfony to look for the `X-Forwarded-*` HTTP headers. HTTP headers that are not part of the \"trusted_headers\" allowed list are ignored and protect you from \"Cache poisoning\" attacks. \n\nIn Symfony 5.2, we've added support for the `X-Forwarded-Prefix` header, but this header was accessible in sub-requests, even if it was not part of the \"trusted_headers\" allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` HTTP header, leading to a web cache poisoning issue.\n\nResolution\n----------\n\nSymfony now ensures that the `X-Forwarded-Prefix` HTTP header is not forwarded to sub-requests when it is not trusted.\n\nThe patch for this issue is available here for branch 5.3.\n\nCredits\n-------\n\nWe would like to thank Soner Sayakci for reporting the issue and Jérémy Derussé for fixing the issue.\n","public_affected_ranges":["ECOSYSTEM: introduced 5.2.0; fixed 5.3.12"]},{"certainty":"source_listed","source_ids":["sr-bbdb5d0680748bcd62e53fab15d391aa"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"Description\n-----------\n\nWhen a Symfony application is running behind a proxy or a load-balancer, you can tell Symfony to look for the `X-Forwarded-*` HTTP headers. HTTP headers that are not part of the \"trusted_headers\" allowed list are ignored and protect you from \"Cache poisoning\" attacks. \n\nIn Symfony 5.2, we've added support for the `X-Forwarded-Prefix` header, but this header was accessible in sub-requests, even if it was not part of the \"trusted_headers\" allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` HTTP header, leading to a web cache poisoning issue.\n\nResolution\n----------\n\nSymfony now ensures that the `X-Forwarded-Prefix` HTTP header is not forwarded to sub-requests when it is not trusted.\n\nThe patch for this issue is available here for branch 5.3.\n\nCredits\n-------\n\nWe would like to thank Soner Sayakci for reporting the issue and Jérémy Derussé for fixing the issue.\n","public_affected_ranges":["ECOSYSTEM: introduced 5.2.0; fixed 5.3.12"]}],"null_published_at":"2026-11-03T17:49:21.361Z","source_updated_at":"2026-07-08T06:28:30.044Z","source_disclosed_at":"2021-11-24T20:04:25.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:42:30.997Z"},{"id":"NVI-00006619","kind":"vulnerability","title":"Webcache Poisoning in symfony/http-kernel","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-q3j3-w37x-hq2q","CVE-2021-41267"],"plain_summary":"OSV carries this publisher advisory for symfony/http-kernel, symfony/symfony. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 5.3.12 for symfony/http-kernel. Confirm the publisher’s latest guidance.","source_ids":["sr-bbdb5d0680748bcd62e53fab15d391aa"],"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 5.3.12 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-bbdb5d0680748bcd62e53fab15d391aa"],"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":[],"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-bbdb5d0680748bcd62e53fab15d391aa","url":"https://github.com/advisories/GHSA-q3j3-w37x-hq2q","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-q3j3-w37x-hq2q","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:30.997Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-bbdb5d0680748bcd62e53fab15d391aa"],"technology":"symfony/http-kernel","known_exclusions":[],"conditions_summary":"Description\n-----------\n\nWhen a Symfony application is running behind a proxy or a load-balancer, you can tell Symfony to look for the `X-Forwarded-*` HTTP headers. HTTP headers that are not part of the \"trusted_headers\" allowed list are ignored and protect you from \"Cache poisoning\" attacks. \n\nIn Symfony 5.2, we've added support for the `X-Forwarded-Prefix` header, but this header was accessible in sub-requests, even if it was not part of the \"trusted_headers\" allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` HTTP header, leading to a web cache poisoning issue.\n\nResolution\n----------\n\nSymfony now ensures that the `X-Forwarded-Prefix` HTTP header is not forwarded to sub-requests when it is not trusted.\n\nThe patch for this issue is available here for branch 5.3.\n\nCredits\n-------\n\nWe would like to thank Soner Sayakci for reporting the issue and Jérémy Derussé for fixing the issue.\n","public_affected_ranges":["ECOSYSTEM: introduced 5.2.0; fixed 5.3.12"]},{"certainty":"source_listed","source_ids":["sr-bbdb5d0680748bcd62e53fab15d391aa"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"Description\n-----------\n\nWhen a Symfony application is running behind a proxy or a load-balancer, you can tell Symfony to look for the `X-Forwarded-*` HTTP headers. HTTP headers that are not part of the \"trusted_headers\" allowed list are ignored and protect you from \"Cache poisoning\" attacks. \n\nIn Symfony 5.2, we've added support for the `X-Forwarded-Prefix` header, but this header was accessible in sub-requests, even if it was not part of the \"trusted_headers\" allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` HTTP header, leading to a web cache poisoning issue.\n\nResolution\n----------\n\nSymfony now ensures that the `X-Forwarded-Prefix` HTTP header is not forwarded to sub-requests when it is not trusted.\n\nThe patch for this issue is available here for branch 5.3.\n\nCredits\n-------\n\nWe would like to thank Soner Sayakci for reporting the issue and Jérémy Derussé for fixing the issue.\n","public_affected_ranges":["ECOSYSTEM: introduced 5.2.0; fixed 5.3.12"]}],"null_published_at":"2026-10-31T22:13:10.065Z","source_updated_at":"2026-07-08T06:28:30.044Z","source_disclosed_at":"2021-11-24T20:04:25.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:42:30.997Z"}],"next_cursor":null,"snapshot_revision":"42594"}