Vulnerability Description
Guzzle is an extensible PHP HTTP client. Prior to 7.12.3, CookieJar did not restrict cookies scoped to IP-address or bare-numeric Domain values to the exact host that set them, because SetCookie::matchesDomain() applied ordinary suffix matching to domains such as 192.168.0.1, [::1], or 1, allowing cross-host cookie disclosure, cookie injection, or session fixation. This issue is fixed in version 7.12.3.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Guzzlephp | Guzzle | < 7.12.3 |
Related Weaknesses (CWE)
References
- https://github.com/guzzle/guzzle/commit/b9944c161b12d9ee9c9334cfc5b9659ecd7451f8Patch
- https://github.com/guzzle/guzzle/pull/3694Issue TrackingPatch
- https://github.com/guzzle/guzzle/releases/tag/7.12.3Release Notes
- https://github.com/guzzle/guzzle/security/advisories/GHSA-g446-98w2-8p5wMitigationVendor Advisory
FAQ
What is CVE-2026-59883?
CVE-2026-59883 is a vulnerability with a CVSS score of 4.7 (MEDIUM). Guzzle is an extensible PHP HTTP client. Prior to 7.12.3, CookieJar did not restrict cookies scoped to IP-address or bare-numeric Domain values to the exact host that set them, because SetCookie::matc...
How severe is CVE-2026-59883?
CVE-2026-59883 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-59883?
Check the references section above for vendor advisories and patch information. Affected products include: Guzzlephp Guzzle.