Skip to content
Fencer Vulns
high 7.5

CVE-2025-12105 json

Libsoup: heap use-after-free in libsoup message queue handling during http/2 read completion

published 2025-10-23 12 mo ago modified 2026-11-05 4 d ago also EUVD-2025-35663

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

A flaw was found in the asynchronous message queue handling of the libsoup library, widely used by GNOME and WebKit-based applications to manage HTTP/2 communications. When network operations are aborted at specific timing intervals, an internal message queue item may be freed twice due to missing state synchronization. This leads to a use-after-free memory access, potentially crashing the affected application. Attackers could exploit this behavior remotely by triggering specific HTTP/2 read and cancel sequences, resulting in a denial-of-service condition.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:3.6.5-3.el10_1.7
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.6.5-3.el10_0.10
  • libsoup3 Ubuntu 24.04 LTS 3.4.4-5ubuntu0.6
  • libsoup3 Ubuntu 25.10 3.6.5-4ubuntu0.1
  • libsoup3 Ubuntu Pro 22.04 LTS 3.0.7-0ubuntu1+esm6

ubuntu advisories UBUNTU-CVE-2025-12105

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

  • libsoup3 RHEL 10.1 3.6.5-3.el10_1.7
  • libsoup3 enterprise linux eus 10.0 3.6.5-3.el10_0.10

red hat advisories RHSA-2025:23437RHSA-2025:23139

  • libsoup SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.6.6-160000.1.1
  • libsoup Linux Micro 6.0 3.4.2-13.1
  • libsoup Linux Micro 6.1 3.4.4-slfo.1.1_6.1
  • libsoup SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 +1 more 3.4.4-150600.3.21.1
  • libsoup SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +7 more 3.0.4-150400.3.21.1

suse advisories SUSE-SU-2026:20752-1SUSE-SU-2026:20902-1SUSE-SU-2026:20529-1SUSE-SU-2026:20360-1SUSE-SU-2026:0017-1SUSE-SU-2025:4514-1

  • libsoup openSUSE Leap 16.0 3.6.6-160000.1.1
  • libsoup openSUSE Tumbleweed 3.6.5-9.1

opensuse advisories openSUSE-SU-2026:20384-1openSUSE-SU-2025:15766-1

  • libsoup3 Rocky Linux 10 3.6.5-3.el10_1.7

rocky linux advisories RLSA-2025:23139

  • libsoup Azure Linux 3.0 3.4.4-11

azure linux advisories AZL-72841

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2025-12105 updated cvss 7.5

libsoup: Heap Use-After-Free in libsoup message queue handling during HTTP/2 read completion

  • Red Hat Enterprise Linux 6 libsoup
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 10) libsoup3 3.6.5-3.el10_1.7
    fixed: vendor fix RHSA-2025:23139
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) libsoup3 3.6.5-3.el10_0.10
    fixed: vendor fix RHSA-2025:23437
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libsoup3-doc 3.6.5-3.el10_1.7
    fixed: vendor fix RHSA-2025:23139
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libsoup3-doc 3.6.5-3.el10_0.10
    fixed: vendor fix RHSA-2025:23437
  • Red Hat Enterprise Linux 7 libsoup Red Hat Enterprise Linux 8 libsoup Red Hat Enterprise Linux 9 libsoup
    not affected: vulnerable code not present

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
yes
Technical impact
partial
Assessed
12 mo ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • GNOME libsoup
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness

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.