Vulnerability in Gnome Libsoup

CVE-2026-5119

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…

EPSS: 0.000 (2.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-5119?
CVE-2026-5119 is a medium-severity vulnerability in Gnome Libsoup, classified under Cleartext Transmission of Sensitive Information. CVSS score: 5.9/10. Published 2026-03-30.
How severe is CVE-2026-5119?
Medium severity. CVSS v3 base score is 5.9 out of 10.