Medium severity5.3NVD Advisory· Published Apr 17, 2023· Updated Jun 17, 2026
CVE-2023-29197
CVE-2023-29197
Description
guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Affected versions are subject to improper 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. This is a follow-up to CVE-2022-24775 where the fix was incomplete. The issue has been patched in versions 1.9.1 and 2.4.5. There are no known workarounds for this vulnerability. Users are advised to upgrade.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
guzzlehttp/psr7Packagist | < 1.9.1 | 1.9.1 |
guzzlehttp/psr7Packagist | >= 2.0.0, < 2.4.5 | 2.4.5 |
Affected products
2Patches
Vulnerability mechanics
References
12- github.com/advisories/GHSA-wxmh-65f7-jcvwghsaADVISORY
- github.com/guzzle/psr7/security/advisories/GHSA-wxmh-65f7-jcvwnvdVendor AdvisoryWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FJANWDXJZE5BGLN4MQ4FEHV5LJ6CMKQF/nvdMailing ListThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O35UN4IK6VS2LXSRWUDFWY7NI73RKY2U/nvdMailing ListThird Party Advisory
- nvd.nist.gov/vuln/detail/CVE-2023-29197ghsaADVISORY
- cve.mitre.org/cgi-bin/cvename.cginvdNot ApplicableWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/guzzlehttp/psr7/CVE-2023-29197.yamlghsaWEB
- github.com/guzzle/psr7/security/advisories/GHSA-q7rv-6hp3-vh96nvdNot ApplicableWEB
- lists.debian.org/debian-lts-announce/2023/12/msg00028.htmlnvdWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FJANWDXJZE5BGLN4MQ4FEHV5LJ6CMKQFghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O35UN4IK6VS2LXSRWUDFWY7NI73RKY2UghsaWEB
- www.rfc-editor.org/rfc/rfc7230nvdTechnical DescriptionWEB
News mentions
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