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.
History

Mon, 03 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 01 Aug 2026 12:45:00 +0000

Type Values Removed Values Added
Description 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.
Title guzzlehttp/guzzle before 7.14.2 Proxy-Authorization Header Disclosure
First Time appeared Guzzlephp
Guzzlephp guzzle
Weaknesses CWE-200
CPEs cpe:2.3:a:guzzlephp:guzzle:*:*:*:*:*:*:*:*
Vendors & Products Guzzlephp
Guzzlephp guzzle
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-08-01T12:22:17.139Z

Updated: 2026-08-03T18:08:40.368Z

Reserved: 2026-07-29T13:09:45.992Z

Link: CVE-2026-67339

cve-icon Vulnrichment

Updated: 2026-08-03T18:08:09.904Z

cve-icon NVD

No data.

cve-icon Redhat

No data.