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Vulnerability · Published Mar 30, 2026 · Assigned by redhat

CVE-2026-5119Libsoup: libsoup: information disclosure via cleartext transmission of cookies during https tunnel establishment

Medium 5.9

In plain English

A medium-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.3%top 82.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8libsoup2.62.3-14.el8_10ALSA-2026:14087
AlmaLinux:9libsoup2.72.0-16.el9_8.1ALSA-2026:19356
AlmaLinux:9libsoup2.72.0-12.el9_7.6ALSA-2026:13978
AlmaLinux:8libsoup-devel2.62.3-14.el8_10ALSA-2026:14087
AlmaLinux:9libsoup-devel2.72.0-12.el9_7.6ALSA-2026:13978
AlmaLinux:9libsoup-devel2.72.0-16.el9_8.1ALSA-2026:19356
AlmaLinux:10libsoup33.6.5-3.el10_2.11ALSA-2026:19143
AlmaLinux:10libsoup3-devel3.6.5-3.el10_2.11ALSA-2026:19143
AlmaLinux:10libsoup3-doc3.6.5-3.el10_1.11ALSA-2026:15968
AlmaLinux:10libsoup3-doc3.6.5-3.el10_2.11ALSA-2026:19143
Debian:12libsoup2.4no fix listedDEBIAN-CVE-2026-5119
Debian:13libsoup2.4no fix listedDEBIAN-CVE-2026-5119
Debian:12libsoup3no fix listedDEBIAN-CVE-2026-5119
Debian:13libsoup3no fix listedDEBIAN-CVE-2026-5119
Rocky Linux:8libsoup0:2.62.3-14.el8_10RLSA-2026:14087
Rocky Linux:9libsoup0:2.72.0-16.el9_8.1RLSA-2026:19356
Rocky Linux:9libsoup0:2.72.0-12.el9_7.6RLSA-2026:13978
Rocky Linux:10libsoup30:3.6.5-3.el10_1.11RLSA-2026:15968
Ubuntu:22.04:LTSlibsoup2.42.74.2-3ubuntu0.9USN-8890-1
Ubuntu:22.04:LTSlibsoup2.42.74.2-3ubuntu0.7UBUNTU-CVE-2026-5119
Ubuntu:22.04:LTSlibsoup2.42.74.2-3ubuntu0.7USN-8523-1
Ubuntu:24.04:LTSlibsoup2.42.74.3-6ubuntu1.7UBUNTU-CVE-2026-5119
Ubuntu:24.04:LTSlibsoup2.42.74.3-6ubuntu1.7USN-8523-1
Ubuntu:24.04:LTSlibsoup2.42.74.3-6ubuntu1.9USN-8890-1
Ubuntu:25.10libsoup2.42.74.3-10.1ubuntu4.1UBUNTU-CVE-2026-5119
Ubuntu:25.10libsoup2.42.74.3-10.1ubuntu4.1USN-8523-1
Ubuntu:26.10libsoup2.4no fix listedUBUNTU-CVE-2026-5119
Ubuntu:24.04:LTSlibsoup33.4.4-5ubuntu0.9USN-8890-1
Ubuntu:24.04:LTSlibsoup33.4.4-5ubuntu0.9UBUNTU-CVE-2026-5119
Ubuntu:25.10libsoup3no fix listedUBUNTU-CVE-2026-5119
Ubuntu:26.04:LTSlibsoup33.6.6-1ubuntu0.1UBUNTU-CVE-2026-5119
Ubuntu:26.04:LTSlibsoup33.6.6-1ubuntu0.1USN-8890-1
Ubuntu:26.10libsoup33.6.6-1ubuntu3UBUNTU-CVE-2026-5119
Ubuntu:26.10libsoup33.6.6-1ubuntu3USN-8890-2

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 6 see references

Weakness: CWE-319 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

References