guzzlehttp/psr7 < 1.9.1 & 2.4.5 - Interpretation Conflict
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.
While some WordPress plugins and themes may be using this library, it does not make them vulnerable to exploitation.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | guzzlehttp/psr7 | < 1.9.1, >= 2.0.0, < 2.4.5 | 1.9.1, 2.4.5 |
| WordPress plugin | WP Offload Media Lite for Amazon S3, DigitalOcean Spaces, and Google Cloud Storage | < 3.2.2 | 3.2.2 |
| WordPress plugin | WP Offload SES Lite | < 1.6.4 | 1.6.4 |
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
- https://www.wordfence.com/threat-intel/vulnerabilities/id/2638bb80-7066-45c0-ab74-4ba407d50cae?source=api-prod
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-436- Platform
- Composer, WordPress
- Package
guzzlehttp/psr7, WP Offload Media Lite for Amazon S3, DigitalOcean Spaces, and Google Cloud Storage, WP Offload SES Lite- Disclosed
- 17.04.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-wxmh-65f7-jcvw - CC BY 4.0
Wordfence Intelligence - 2638bb80-7066-45c0-ab74-4ba407d50cae - Wordfence Intelligence
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Vulnerability history: guzzlehttp/psr7
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 03.2022 07.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 5
Disclosures per year
- 2022: 1
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 4
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guzzlehttp/psr7 < 1.9.1 & 2.4.5 - Interpretation Conflict this entry
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