Insertion of Sensitive Information Into Sent Data in guzzle - CVE-2026-67355

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Main Vulnerability Database Vulnerabilities #VU159746

Insertion of Sensitive Information Into Sent Data in guzzle - CVE-2026-67355

Published: November 6, 2026


Vulnerability identifier: #VU159746
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-67355
CWE-ID: CWE-201
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows an unauthenticated remote attacker to obtain sensitive host-only cookies intended for a parent host.

The vulnerability exists due to Guzzle's CookieJar treating cookies with absent or empty Domain attributes as domain-scoped rather than host-only. An unauthenticated remote attacker controlling or observing a child host can receive these cookies when cookie support is enabled and the application reuses the parent's built-in jar for a later child request satisfying the cookie's other restrictions.


Affected software

guzzle
Communications Unified Assurance

How to mitigate CVE-2026-67355

Install security update from vendor's website.

guzzle - update to 7.15.1

External References

Related Security Bulletins