CVE-2026-67339 (Medium) detected in guzzlehttp/guzzle-7.10.0

[mend-bolt-for-github]

CVE-2026-67339 - Medium Severity Vulnerability

Vulnerable Library - guzzlehttp/guzzle-7.10.0

Guzzle is a PHP HTTP client library

Library home page: https://api.github.com/repos/guzzle/guzzle/zipball/b51ac707cfa420b7bfd4e4d5e510ba8008e822b4

Dependency Hierarchy:

• ❌ guzzlehttp/guzzle-7.10.0 (Vulnerable Library)

Found in HEAD commit: 81f84f058af0cbca57ee22476557ded21c6813aa

Found in base branch: master

Vulnerability Details

guzzlehttp/guzzle versions before 7.14.2 fail to properly isolate Proxy-Authorization headers from origin servers in cURL handlers. Attackers can capture proxy credentials through origin server access logs when requests are redirected, bypassed, or sent through SOCKS proxies that Guzzle misclassifies as direct connections.

Publish Date: 2026-08-01

URL: CVE-2026-67339

CVSS 3 Score Details (5.3)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: Low
  • Integrity Impact: None
  • Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-94pj-82f3-465w

Release Date: 2026-08-01

Fix Resolution: guzzlehttp/guzzle - 7.14.2,https://github.com/guzzle/guzzle.git - 7.14.2

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