PT-2026-56501 · Guzzle · Guzzle

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-59883

Mitre

CVSS v3.1

4.7

Medium

Base vector

AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

Fix

Session Fixation

Origin Validation Error

Weakness Enumeration

CWE-384

CWE-346

Related Identifiers

CVE-2026-59883

Affected Products

Guzzle

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-59883 · Security Note
• https://github.com/guzzle/guzzle/security/advisories/GHSA-g446-98w2-8p5w · Note
• https://github.com/guzzle/guzzle/pull/3694 · Note
• https://github.com/guzzle/guzzle/commit/b9944c161b12d9ee9c9334cfc5b9659ecd7451f8 · Note
• https://github.com/guzzle/guzzle/releases/tag/7.12.3 · Note