CVE-2026-67339CWE-200information-disclosure

CVE-2026-67339

Medium · published August 1, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
30.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00372 · 30.0th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-08-01T17:17Z
References (2)
https://github.com/guzzle/guzzle/security/advisories/GHSA-94pj-82f3-465w · [email protected]https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-proxy-authorization-header-disclosure · [email protected]
EPSS history
Timeline
  • 01 AUG 12:22Z
    guzzlehttp/guzzle before 7.14.2 Proxy-Authorization Header Disclosure
    cvelistv5