CVE-2026-5119

moderate-risk

Published 2026-03-30

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.

Do I need to act?

0.01% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.9/10 Medium

NETWORK / HIGH complexity

Affected Products (5)

Libsoup

Enterprise Linux

Affected Vendors

Redhat Gnome

References (3)

Vendor Advisory https://access.redhat.com/security/cve/CVE-2026-5119

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2452932

Exploit https://gitlab.gnome.org/GNOME/libsoup/-/issues/502

/ 100

moderate-risk

Severity 18/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 12/34 · Low