{"id":"GHSA-wxmh-65f7-jcvw","aliases":["CVE-2023-29197"],"title":"Improper header name validation in guzzlehttp/psr7","description":"### Impact\n\nImproper header parsing. An attacker could sneak in a newline (`\\n`) into both the header names and values. While the specification states that `\\r\\n\\r\\n` is used to terminate the header list, many servers in the wild will also accept `\\n\\n`.\n\n### Patches\n\nThe issue is patched in 1.9.1 and 2.4.5.\n\n### Workarounds\n\nThere are no known workarounds.\n\n### References\n\n* https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4\n","severity":"medium","score":5.3,"published":"2023-04-19T18:25:53.000Z","modified":"2026-02-04T04:19:33.828Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"guzzlehttp/psr7","ranges":[{"events":[{"introduced":"0"},{"fixed":"1.9.1"}],"type":"ECOSYSTEM"}],"versions":["1.0.0","1.1.0","1.2.0","1.2.1","1.2.2","1.2.3","1.3.0","1.3.1","1.4.0","1.4.1","1.4.2","1.5.0","1.5.1","1.5.2","1.6.0","1.6.1","1.7.0","1.8.0","1.8.1","1.8.2","1.8.3","1.8.4","1.8.5","1.9.0"],"fixed":["1.9.1"]},{"ecosystem":"Packagist","name":"guzzlehttp/psr7","ranges":[{"events":[{"introduced":"2.0.0"},{"fixed":"2.4.5"}],"type":"ECOSYSTEM"}],"versions":["2.0.0","2.1.0","2.1.1","2.1.2","2.2.0","2.2.1","2.2.2","2.3.0","2.4.0","2.4.1","2.4.2","2.4.3","2.4.4"],"fixed":["2.4.5"]}],"references":["https://github.com/guzzle/psr7/security/advisories/GHSA-q7rv-6hp3-vh96","https://github.com/guzzle/psr7/security/advisories/GHSA-wxmh-65f7-jcvw","https://nvd.nist.gov/vuln/detail/CVE-2023-29197","https://cve.mitre.org/cgi-bin/cvename.cgi?name=2022-24775","https://github.com/FriendsOfPHP/security-advisories/blob/master/guzzlehttp/psr7/CVE-2023-29197.yaml","https://github.com/guzzle/psr7","https://lists.debian.org/debian-lts-announce/2023/12/msg00028.html","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FJANWDXJZE5BGLN4MQ4FEHV5LJ6CMKQF","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O35UN4IK6VS2LXSRWUDFWY7NI73RKY2U","https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4"],"sources":[{"name":"OSV","id":"GHSA-wxmh-65f7-jcvw","modified":"2026-02-04T04:19:33.828903Z","url":"https://osv.dev/vulnerability/GHSA-wxmh-65f7-jcvw"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3}]}