CVE-2026-67339: guzzlehttp/guzzle before 7.14.2 Proxy-Authorization Header Disclosure

Published Aug 1, 2026
·
Updated

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.

Affected Software

1 affected component
guzzlehttp/guzzle<7.14.2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade guzzlehttp/guzzle to a version that resolves this vulnerability.

    Fixed in 7.14.2
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch guzzlehttp/guzzle before 7.14.2 Proxy-Authorization Header Disclosure

Event History

Aug 1, 2026
CVE Published
via MITRE·12:22 PM
Data Sourced
via MITRE·12:22 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·01:17 PM
DescriptionSeverityWeakness
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