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 proxy can intercept these cookies, leading to potential session hijacking or user impersonation.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (15.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- GNOME Libsoup
- Red Hat Enterprise Linux 10 — versions 0:3.6.5-3.el10_2.11, 0:3.6.5-3.el10_1.11
- Red Hat Enterprise Linux 10.0 Extended Update Support — versions 0:3.6.5-3.el10_0.15
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 7 Extended Lifecycle Support — versions 0:2.62.2-12.el7_9
- Red Hat Enterprise Linux 8 — versions 0:2.62.3-14.el8_10
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support — versions 0:2.62.3-2.el8_4.9
- Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On — versions 0:2.62.3-2.el8_4.9
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support — versions 0:2.62.3-2.el8_6.9
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-5119 (Mitigation, vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
- gitlab.gnome.org/GNOME/libsoup/-/issues/502 (Exploit, Issue Tracking)
- access.redhat.com/errata/RHSA-2026:13978 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:14087 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:15968 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:17482 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:19143 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:19356 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:21686 (vendor-advisory)
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.