CVE-2026-66339 — Libsoup: libsoup: proxy credentials leak to destination server via proxy-authorization header in connect tunnels

CVE-2026-66339

Libsoup: libsoup: proxy credentials leak to destination server via proxy-authorization header in connect tunnels PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Red Hat / Red Hat Enterprise Linux 10	affected
Red Hat / Red Hat Enterprise Linux 6	affected
Red Hat / Red Hat Enterprise Linux 7	affected
Red Hat / Red Hat Enterprise Linux 8	affected
Red Hat / Red Hat Enterprise Linux 9	affected

CWE

CWE-201

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.