What is GHSA-6qvf-c7g3-j256?

GHSA-6qvf-c7g3-j256 is a security advisory published by GitHub Security Advisories with Critical severity. An HTTP proxy can trick libcurl into sending the origin's credentials (Basic password, or a...

Which CVE IDs does GHSA-6qvf-c7g3-j256 cover?

GHSA-6qvf-c7g3-j256 covers the following CVE IDs: CVE-2026-86414. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-6qvf-c7g3-j256?

GHSA-6qvf-c7g3-j256 has a CVSS v3 base score of 9.1, published by GitHub Security Advisories.

GHSA-6qvf-c7g3-j256CriticalCVSS 9.1

An HTTP proxy can trick libcurl into sending the origin's credentials (Basic password, or a...

Vendor

GitHub Security Advisories

Published

October 20, 2026

Last Modified

October 30, 2026

🔗 CVE IDs covered (1)

CVE-2026-86414 →

📋 Description

An HTTP proxy can trick libcurl into sending the origin's credentials (Basic password, or a Negotiate/Kerberos ticket) to the proxy itself, by answering the CONNECT tunnel request with 401 WWW-Authenticate: instead of the expected 407 Proxy-Authenticate:.

🔗 References (5)

https://nvd.nist.gov/vuln/detail/CVE-2026-86414
https://hackerone.com/reports/3993566
https://curl.se/docs/CVE-2026-86414.html
https://curl.se/docs/CVE-2026-86414.json
https://github.com/advisories/GHSA-6qvf-c7g3-j256