CVE-2026-66339

Published: Jul 24, 2026Modified: Aug 24, 2026

6.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Exploitability: 2.8 / Impact: 3.6

Source: secalert@redhat.com (Secondary)

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.

Affected (6)

Products: Gnome: Libsoup · Redhat: Enterprise Linux

1 product

1 product

Configuration A

6 vulnerable

Vulnerable Software	Affected Versions
Gnome Libsoup	All versions
Redhat Enterprise Linux	Version 10.0
Redhat Enterprise Linux	Version 6.0
Redhat Enterprise Linux	Version 7.0
Redhat Enterprise Linux	Version 8.0
Redhat Enterprise Linux	Version 9.0

Related CWEs

CWE-201

Insertion of Sensitive Information Into Sent Data

The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.

References (2)

https://access.redhat.com/security/cve/CVE-2026-66339

Source: secalert@redhat.com

Vendor Advisory

https://bugzilla.redhat.com/show_bug.cgi?id=2506951

Source: secalert@redhat.com

Issue TrackingVendor AdvisoryExploitMitigation

Timeline

No history available yet.