CVE Catalog

CVE-2026-67339

MediumCVSS 5.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.37%

29th percentile - higher than 29% of all known CVEs

Summary

GuzzleHttp before version 7.14.2 fails 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.

Risk Assessment

The risk involves leakage of sensitive proxy credentials, potentially allowing an attacker to access internal network resources or perform further man-in-the-middle attacks.

Recommendation

It is recommended to immediately update the GuzzleHttp library to version 7.14.2 or later.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS