Vulnerability Description
guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Prior to 2.12.3, Uri::assertValidHost() does not reject URI host components containing authority delimiters, embedded ports, or malformed IPv6 brackets, allowing Uri::getHost() to disagree with the URI authority used for security or routing decisions. This issue is fixed in version 2.12.3.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Guzzlephp | Psr-7 | < 2.12.3 |
Related Weaknesses (CWE)
References
- https://github.com/guzzle/psr7/commit/ddd64f17d4cc1f7e5ffe6fd2c989ec7221712580Patch
- https://github.com/guzzle/psr7/pull/811Issue TrackingPatch
- https://github.com/guzzle/psr7/releases/tag/2.12.3ProductRelease Notes
- https://github.com/guzzle/psr7/security/advisories/GHSA-c2w2-prh8-qm98MitigationVendor Advisory
FAQ
What is CVE-2026-59882?
CVE-2026-59882 is a vulnerability with a CVSS score of 4.2 (MEDIUM). guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Prior to 2.12.3, Uri::assertValidHost() does not reject URI host components containing authority delimiters, embedded ports, or m...
How severe is CVE-2026-59882?
CVE-2026-59882 has been rated MEDIUM with a CVSS base score of 4.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-59882?
Check the references section above for vendor advisories and patch information. Affected products include: Guzzlephp Psr-7.