CVE-2026-5119: Gnome Libsoup

High severity, CVSS 8.2. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw was found in libsoup. When establishing HTTPS tunnels through a configured HTTP proxy, sensitive session cookies are transmitted in cleartext within the initial HTTP CONNECT request. A network-positioned attacker or a malicious HTTP proxy can intercept these cookies, leading to potential session hijacking or user impersonation.

Affected products

• Gnome Libsoup: affected versions not specified
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only

Published 2026-03-30. Last modified 2026-06-17.