What is GHSA-vh9q-f797-xwg7?

GHSA-vh9q-f797-xwg7 is a security advisory published by GitHub Security Advisories with Medium severity. A flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup...

Which CVE IDs does GHSA-vh9q-f797-xwg7 cover?

GHSA-vh9q-f797-xwg7 covers the following CVE IDs: CVE-2026-66339. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-vh9q-f797-xwg7?

GHSA-vh9q-f797-xwg7 has a CVSS v3 base score of 6.5, published by GitHub Security Advisories.

GHSA-vh9q-f797-xwg7MediumCVSS 6.5

A flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup...

Vendor

GitHub Security Advisories

Published

July 25, 2026

Last Modified

July 25, 2026

🔗 CVE IDs covered (1)

CVE-2026-66339 →

📋 Description

A flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup incorrectly attaches the Proxy-Authorization header to subsequent HTTPS requests sent through that tunnel to the destination server. This allows the destination server to capture proxy credentials, leading to information disclosure.

🔗 References (4)

https://nvd.nist.gov/vuln/detail/CVE-2026-66339
https://access.redhat.com/security/cve/CVE-2026-66339
https://bugzilla.redhat.com/show_bug.cgi?id=2506951
https://github.com/advisories/GHSA-vh9q-f797-xwg7