REDHAT-BUG-2506951: Medium severity Gnome libsoup vulnerability

Published Jul 24, 2026
·
Updated

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 means the destination server receives proxy credentials in cleartext (within the TLS session). Per HTTP standards, Proxy-Authorization should only appear on the CONNECT request itself, never on requests forwarded through the established tunnel. The proxy authentication logic in authmsgstarting() in libsoup/auth/soup-auth-manager.c runs unconditionally for all messages without checking whether the current request is being sent through an already-established CONNECT tunnel. This is distinct from CVE-2026-12547 which covers credential leak on proxy switch.

Upstream report: https://gitlab.gnome.org/GNOME/libsoup/-/workitems/534 PSIRTSUPT: https://redhat.atlassian.net/browse/PSIRTSUPT-17666

Affected Software

1 affected component
Gnome libsoup

Event History

Jul 24, 2026
Data Sourced
via Red Hat·10:29 PM
DescriptionSeverityAffected Software
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