{"items":[{"id":"NVI-00002669","kind":"vulnerability","title":"guzzlehttp/psr7: CRLF Injection in HTTP Start-Line Serialization","revision":6,"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-vm85-hxw5-5432","CVE-2026-55766"],"plain_summary":"GitHub lists this reviewed advisory for guzzlehttp/psr7. 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-044db2d38e0bcf57a34fdc8be54abeb3"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. 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This is not the normal request-sending path used by `guzzlehttp/guzzle`; applications using `guzzlehttp/psr7` only through Guzzle's standard HTTP client APIs are not expected to be affected.\n\nApplications are most likely to be affected when they manually serialize P","public_affected_ranges":["< 2.12.1"]},{"certainty":"source_listed","source_ids":["sr-21da52da33255d98a8d9c1cb26f5431e"],"technology":"guzzlehttp/psr7","known_exclusions":[],"conditions_summary":"### Impact\n\n`guzzlehttp/psr7` did not reject CR/LF characters in certain first-party HTTP start-line fields: the request method, protocol version, and response reason phrase. If an application placed attacker-controlled data into one of those fields and later serialized the PSR-7 message as raw HTTP/1.x, for example with `Message::toString()` or an equivalent serializer, the serialized message could contain attacker-controlled header lines. The issue can also be reached through `Message::parseRequest()` or `Message::parseResponse()` when malformed raw messages are parsed into first-party PSR-7 objects and then serialized again.\n\nCreating or modifying a `Request`, `Response`, or other PSR-7 object alone is not sufficient. The issue requires the malformed message to be serialized and written to the network, forwarded, replayed, or otherwise processed by software that does not independently reject the malformed start line. 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The issue can also be reached through `Message::parseRequest()` or `Message::parseResponse()` when malformed raw messages are parsed into first-party PSR-7 objects and then serialized again.\n\nCreating or modifying a `Request`, `Response`, or other PSR-7 object alone is not sufficient. The issue requires the malformed message to be serialized and written to the network, forwarded, replayed, or otherwise processed by software that does not independently reject the malformed start line. This is not the normal request-sending path used by `guzzlehttp/guzzle`; applications using `guzzlehttp/psr7` only through Guzzle's standard HTTP client APIs are not expected to be affected.\n\nApplications are most likely to be affected when they manually serialize P","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 2.12.1"]}],"null_published_at":"2026-10-31T22:13:44.218Z","source_updated_at":"2026-09-10T03:51:09.646Z","source_disclosed_at":"2026-06-19T14:35:57.000Z","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":"2026-10-31T21:42:41.376Z"},{"id":"NVI-00002669","kind":"vulnerability","title":"guzzlehttp/psr7: CRLF Injection in HTTP Start-Line Serialization","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-vm85-hxw5-5432","CVE-2026-55766"],"plain_summary":"OSV carries this publisher advisory for guzzlehttp/psr7. 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 2.12.1 for guzzlehttp/psr7. Confirm the publisher’s latest guidance.","source_ids":["sr-21da52da33255d98a8d9c1cb26f5431e"],"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-21da52da33255d98a8d9c1cb26f5431e","url":"https://github.com/advisories/GHSA-vm85-hxw5-5432","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-vm85-hxw5-5432","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:41.376Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-21da52da33255d98a8d9c1cb26f5431e"],"technology":"guzzlehttp/psr7","known_exclusions":[],"conditions_summary":"### Impact\n\n`guzzlehttp/psr7` did not reject CR/LF characters in certain first-party HTTP start-line fields: the request method, protocol version, and response reason phrase. If an application placed attacker-controlled data into one of those fields and later serialized the PSR-7 message as raw HTTP/1.x, for example with `Message::toString()` or an equivalent serializer, the serialized message could contain attacker-controlled header lines. The issue can also be reached through `Message::parseRequest()` or `Message::parseResponse()` when malformed raw messages are parsed into first-party PSR-7 objects and then serialized again.\n\nCreating or modifying a `Request`, `Response`, or other PSR-7 object alone is not sufficient. The issue requires the malformed message to be serialized and written to the network, forwarded, replayed, or otherwise processed by software that does not independently reject the malformed start line. This is not the normal request-sending path used by `guzzlehttp/guzzle`; applications using `guzzlehttp/psr7` only through Guzzle's standard HTTP client APIs are not expected to be affected.\n\nApplications are most likely to be affected when they manually serialize P","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 2.12.1"]}],"null_published_at":"2026-10-31T22:00:33.899Z","source_updated_at":"2026-09-10T03:51:09.646Z","source_disclosed_at":"2026-06-19T14:35:57.000Z","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":"2026-10-31T21:42:41.376Z"}],"next_cursor":null,"snapshot_revision":"44693"}