CVE-2026-67339

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductGuzzlehttp/guzzle

PublishedAug 1, 2026

First seenAug 1, 2026

Weakness typeCWE-200Sensitive information exposure

How to fix

Update

guzzlehttp/guzzle7.14.2 or later

Vendor advisories

github.com/guzzle/guzzle/security/advisories/GHSA-94pj-82f3-465w

Affected products

Product	Affected versions	Fixed in
guzzlehttp/guzzlePackagist	v < 7.14.2	7.14.2

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