Incorrect Behavior Order: Validate Before Canonicalize in guzzle - CVE-2026-59883

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Main Vulnerability Database Vulnerabilities #VU140088

Incorrect Behavior Order: Validate Before Canonicalize in guzzle - CVE-2026-59883

Published: July 30, 2026


Vulnerability identifier: #VU140088
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-59883
CWE-ID: CWE-180
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to noncanonical cookie domain keeps subdomain scope. A remote attacker can disclose session cookies to attacker-controlled subdomains or inject malicious cookies on the system.


Affected software

guzzle
Fedora
nextcloud

How to mitigate CVE-2026-59883

Install updates from vendor's website.

guzzle - addressed in versions 7.15.2, 8.0.1
nextcloud - addressed in versions 34.0.3-1.el10_2, 34.0.3-1.el10_3, 34.0.3-1.fc44

External References

Related Security Bulletins