PT-2026-56501

CVE-2026-59883

Published

2026-07-08

Updated

2026-10-31

Description by

CVSS 3.1

6.1

Medium

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

Name of the Vulnerable Software and Affected Versions Guzzle versions prior to 7.12.3

Description The CookieJar component fails to restrict cookies scoped to IP addresses or bare-numeric Domain values to the specific host that issued them. This occurs because the matchesDomain() function applies ordinary suffix matching to domains such as 192.168.0.1, [::1], or 1. This behavior can lead to session fixation, cookie injection, or cross-host cookie disclosure.

Recommendations Update to version 7.12.3.

Exploitability

Exploit

Fix

Impacts

Researchers

Grahamcampbell

Vendors

Affected products

Weakness enumeration

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

CWE-384: Session Fixation