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Fencer Vulns
medium 5.9

CVE-2026-5119 json

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

published 2026-03-30 7 mo ago modified 2026-11-05 3 d ago also EUVD-2026-17062

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 17%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:3.6.5-3.el10_1.11, 0:3.6.5-3.el10_2.11
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.6.5-3.el10_0.15
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.62.2-12.el7_9
  • Red Hat Red Hat Enterprise Linux 8 0:2.62.3-14.el8_10
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.62.3-2.el8_4.9
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.62.3-2.el8_4.9
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.62.3-2.el8_6.9
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:2.62.3-2.el8_6.9
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.62.3-3.el8_8.9
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.62.3-3.el8_8.9
  • Red Hat Red Hat Enterprise Linux 9 0:2.72.0-12.el9_7.6, 0:2.72.0-16.el9_8.1
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:2.72.0-8.el9_0.10
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.72.0-8.el9_2.11
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:2.72.0-8.el9_4.10
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.72.0-10.el9_6.7
  • libsoup3 Ubuntu 24.04 LTS 3.4.4-5ubuntu0.9
  • libsoup3 Ubuntu 26.10 3.6.6-1ubuntu3
  • libsoup3 Ubuntu 26.04 LTS 3.6.6-1ubuntu0.1
  • libsoup2.4 Ubuntu 22.04 LTS 2.74.2-3ubuntu0.7
  • libsoup2.4 Ubuntu 24.04 LTS 2.74.3-6ubuntu1.7
  • libsoup2.4 Ubuntu 25.10 2.74.3-10.1ubuntu4.1
  • libsoup3 Ubuntu Pro 22.04 LTS 3.0.7-0ubuntu1+esm9
  • libsoup2.4 Ubuntu Pro 16.04 LTS 2.52.2-1ubuntu0.3+esm6

ubuntu advisories UBUNTU-CVE-2026-5119

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libsoup RHEL 9 2.72.0-16.el9_8.1
  • libsoup3 RHEL 10.2 3.6.5-3.el10_2.11
  • libsoup3 RHEL 10.1 3.6.5-3.el10_1.11
  • libsoup RHEL 8 2.62.3-14.el8_10
  • libsoup RHEL 9 2.72.0-12.el9_7.6
  • libsoup RHEL 7 ELS 2.62.2-12.el7_9
  • libsoup RHEL 8.6 EUS_LONG_LIFE, RHEL 8.6 AUS 2.62.3-2.el8_6.9
  • libsoup RHEL 8.4 EUS_LONG_LIFE, RHEL 8.4 AUS 2.62.3-2.el8_4.9

red hat advisories RHSA-2026:24722RHSA-2026:24344RHSA-2026:22716RHSA-2026:22710RHSA-2026:22317RHSA-2026:22323

  • libsoup3 AlmaLinux 10 3.6.5-3.el10_2.11
  • libsoup AlmaLinux 9 2.72.0-16.el9_8.1
  • libsoup AlmaLinux 9 2.72.0-12.el9_7.6
  • libsoup AlmaLinux 8 2.62.3-14.el8_10

almalinux advisories ALSA-2026:19143ALSA-2026:19356ALSA-2026:13978ALSA-2026:14087

  • libsoup Rocky Linux 9 2.72.0-16.el9_8.1
  • libsoup3 Rocky Linux 10 3.6.5-3.el10_1.11
  • libsoup Rocky Linux 9 2.72.0-12.el9_7.6
  • libsoup Rocky Linux 8 2.62.3-14.el8_10

rocky linux advisories RLSA-2026:19356RLSA-2026:15968RLSA-2026:13978RLSA-2026:14087

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-5119 updated cvss 5.9

libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel establishment

  • Red Hat Enterprise Linux 6 libsoup
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) libsoup-devel 2.62.3-14.el8_10, libsoup-debuginfo 2.62.3-14.el8_10, libsoup-debugsource 2.62.3-14.el8_10
    fixed: vendor fix RHSA-2026:14087
  • Red Hat Enterprise Linux AppStream (v. 9) libsoup 2.72.0-12.el9_7.6, libsoup 2.72.0-16.el9_8.1
    fixed: vendor fix RHSA-2026:13978
  • Red Hat Enterprise Linux AppStream (v. 10) libsoup3 3.6.5-3.el10_1.11, libsoup3 3.6.5-3.el10_2.11
    fixed: vendor fix RHSA-2026:15968
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) libsoup-devel 2.62.3-2.el8_4.9, libsoup-debuginfo 2.62.3-2.el8_4.9, libsoup-debugsource 2.62.3-2.el8_4.9
    fixed: vendor fix RHSA-2026:22716
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) libsoup-devel 2.62.3-2.el8_6.9, libsoup-debuginfo 2.62.3-2.el8_6.9, libsoup-debugsource 2.62.3-2.el8_6.9
    fixed: vendor fix RHSA-2026:24344
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) libsoup-devel 2.62.3-3.el8_8.9, libsoup-debuginfo 2.62.3-3.el8_8.9, libsoup-debugsource 2.62.3-3.el8_8.9
    fixed: vendor fix RHSA-2026:22710
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) libsoup 2.72.0-8.el9_0.10
    fixed: vendor fix RHSA-2026:21686
show 17 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) libsoup 2.72.0-8.el9_2.11
    fixed: vendor fix RHSA-2026:22316
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) libsoup 2.72.0-8.el9_4.10
    fixed: vendor fix RHSA-2026:22323
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) libsoup3 3.6.5-3.el10_0.15
    fixed: vendor fix RHSA-2026:17482
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) libsoup 2.72.0-10.el9_6.7
    fixed: vendor fix RHSA-2026:22317
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) libsoup-devel 2.62.3-2.el8_4.9, libsoup-debuginfo 2.62.3-2.el8_4.9, libsoup-debugsource 2.62.3-2.el8_4.9
    fixed: vendor fix RHSA-2026:22716
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) libsoup-devel 2.62.3-2.el8_6.9, libsoup-debuginfo 2.62.3-2.el8_6.9, libsoup-debugsource 2.62.3-2.el8_6.9
    fixed: vendor fix RHSA-2026:24344
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) libsoup-devel 2.62.3-3.el8_8.9, libsoup-debuginfo 2.62.3-3.el8_8.9, libsoup-debugsource 2.62.3-3.el8_8.9
    fixed: vendor fix RHSA-2026:22710
  • Red Hat Enterprise Linux BaseOS (v. 8) libsoup 2.62.3-14.el8_10
    fixed: vendor fix RHSA-2026:14087
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) libsoup 2.62.3-2.el8_4.9
    fixed: vendor fix RHSA-2026:22716
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) libsoup 2.62.3-2.el8_6.9
    fixed: vendor fix RHSA-2026:24344
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) libsoup 2.62.3-3.el8_8.9
    fixed: vendor fix RHSA-2026:22710
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) libsoup 2.62.3-2.el8_4.9
    fixed: vendor fix RHSA-2026:22716
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) libsoup 2.62.3-2.el8_6.9
    fixed: vendor fix RHSA-2026:24344
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) libsoup 2.62.3-3.el8_8.9
    fixed: vendor fix RHSA-2026:22710
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libsoup3-doc 3.6.5-3.el10_1.11, libsoup3-doc 3.6.5-3.el10_2.11
    fixed: vendor fix RHSA-2026:15968
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libsoup3-doc 3.6.5-3.el10_0.15
    fixed: vendor fix RHSA-2026:17482
  • Red Hat Enterprise Linux Server (v. 7 ELS) libsoup 2.62.2-12.el7_9
    fixed: vendor fix RHSA-2026:24722

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.gnome.org https://gitlab.gnome.org/GNOME/libsoup/-/issues/502 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N
NVD 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected products

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

Classification

Weakness
  • CWE-319 Cleartext Transmission of Sensitive Information

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.