MEDIUM 6.9 NVD
CVE-2026-67339
guzzlehttp/guzzle versions before 7.14.2 fail to properly isolate Proxy-Authorization headers from origin servers in cURL handlers. Attackers can capture proxy
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.
References
- https://github.com/guzzle/guzzle/security/advisories/GHSA-94pj-82f3-465w
- https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-proxy-authorization-header-d
This medium severity vulnerability with a CVSS score of 6.9 was published on 2026-08-01 via NVD.
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