CVE-2026-5119

Libsoup: libsoup: information disclosure via cleartext transmission of cookies during https tunnel establishment

State: Published
Severity: 5.9 Medium
Published: Mar 30, 2026
Updated: Jun 9, 2026
Reserved: Mar 30, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N	redhat

Weaknesses

CWE-319 Cleartext Transmission of Sensitive Information

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat	0:3.6.5-3.el10_1.11 and laterNot affected
Red Hat Enterprise Linux 10Red Hat	0:3.6.5-3.el10_2.11 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:3.6.5-3.el10_0.15 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:2.62.2-12.el7_9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:2.62.3-14.el8_10 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:2.62.3-14.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:2.62.3-2.el8_4.9 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	0:2.62.3-2.el8_4.9 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:2.62.3-2.el8_6.9 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:2.62.3-2.el8_6.9 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:2.62.3-3.el8_8.9 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:2.62.3-3.el8_8.9 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.72.0-12.el9_7.6 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.72.0-16.el9_8.1 and laterNot affected
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat	0:2.72.0-8.el9_0.10 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:2.72.0-8.el9_2.11 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:2.72.0-8.el9_4.10 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:2.72.0-10.el9_6.7 and laterNot affected
Red Hat Enterprise Linux 6Red Hat

References

RHSA-2026:13978vendor-advisory
RHSA-2026:14087vendor-advisory
RHSA-2026:15968vendor-advisory
RHSA-2026:17482vendor-advisory
RHSA-2026:19143vendor-advisory
RHSA-2026:19356vendor-advisory
RHSA-2026:21686vendor-advisory
RHSA-2026:22316vendor-advisory
RHSA-2026:22317vendor-advisory
RHSA-2026:22323vendor-advisory
RHSA-2026:22710vendor-advisory
RHSA-2026:22716vendor-advisory
RHSA-2026:24344vendor-advisory
RHSA-2026:24722vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-5119vdb-entry
RHBZ#2452932issue-tracking
https://gitlab.gnome.org/GNOME/libsoup/-/issues/502

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