CVE-2026-67339
guzzlehttp/guzzle before 7.14.2 Proxy-Authorization Header Disclosure
- State
- Published
- Severity
- 6.9 Medium
- Published
- Aug 1, 2026
- Updated
- Oct 8, 2026
- Reserved
- Jul 29, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N | VulnCheck |
Weaknesses
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
Affected Products
| Product | Versions |
|---|---|
guzzleguzzle |
|
References
- GitHub Security Advisory (GHSA-94pj-82f3-465w)vendor-advisory
- VulnCheck Advisory: guzzlehttp/guzzle before 7.14.2 Proxy-Authorization Header Disclosurethird-party-advisory
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