CVE-2026-67339 — guzzlehttp/guzzle before 7.14.2 Proxy-Authorization Header Disclosure
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 throu…
Published: 2026-08-01 · CVSS: 6.9 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7