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Vulnerability record · CVE-2026-5119 · published 30 March 2026

CVE-2026-5119: Gnome libsoup cleartext transmission vulnerability

Gnome · Libsoup

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.

8.2 CVSS 3.1 High EPSS 0.33% · top 76.6% CWE-319 · Cleartext transmission
8.2CVSS 3.1 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
17References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:13978
https://access.redhat.com/errata/RHSA-2026:14087
https://access.redhat.com/errata/RHSA-2026:15968
https://access.redhat.com/errata/RHSA-2026:17482
https://access.redhat.com/errata/RHSA-2026:19143
https://access.redhat.com/errata/RHSA-2026:19356
https://access.redhat.com/errata/RHSA-2026:21686
https://access.redhat.com/errata/RHSA-2026:22316
https://access.redhat.com/errata/RHSA-2026:22317
https://access.redhat.com/errata/RHSA-2026:22323
https://access.redhat.com/errata/RHSA-2026:22710
https://access.redhat.com/errata/RHSA-2026:22716
https://access.redhat.com/errata/RHSA-2026:24344
https://access.redhat.com/errata/RHSA-2026:24722
https://access.redhat.com/security/cve/CVE-2026-5119 MitigationVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2452932 Issue TrackingVendor Advisory
https://gitlab.gnome.org/GNOME/libsoup/-/issues/502 ExploitIssue Tracking

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-5119), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.