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.

CVSS Vector

References

• https://access.redhat.com/security/cve/CVE-2026-66339
• https://bugzilla.redhat.com/show_bug.cgi?id=2506951