Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GNOME | libsoup | ≤ 3.6.5 | — |
| 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 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | libsoup3 | No fix yet | — |
| Debian 12 | libsoup3 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | libsoup3 | 3.6.5-4ubuntu0.1 | USN-7932-1 |
| Ubuntu 24.04 LTS | libsoup3 | 3.4.4-5ubuntu0.6 | USN-7932-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | libsoup3 | 3.0.7-0ubuntu1+esm6 | USN-7932-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | libsoup3 +2 | 3.6.5-3.el10_1.7 | RHSA-2025:23139 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | libsoup3 +2 | 3.6.5-3.el10_0.10 | RHSA-2025:23437 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | libsoup3-doc | 3.6.5-3.el10_1.7 | ALSA-2025:23139 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | libsoup3 | 3.6.5-3.el10_1.7 | RLSA-2025:23139 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libsoup | 3.4.4-150600.3.21.1 | SUSE-SU-2026:0017-1 |
| SLES 15 SP6 | libsoup | 3.4.4-150600.3.21.1 | SUSE-SU-2026:0017-1 |
| SLES 15 SP5 | libsoup | 3.0.4-150400.3.21.1 | SUSE-SU-2025:4514-1 |
| SLES 15 SP4 | libsoup | 3.0.4-150400.3.21.1 | SUSE-SU-2025:4514-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libsoup | 3.6.6-160000.1.1 | SUSE-SU-2026:20902-1 |
| SLES for SAP 15 SP6 | libsoup | 3.4.4-150600.3.21.1 | SUSE-SU-2026:0017-1 |
| SLES for SAP 15 SP5 | libsoup | 3.0.4-150400.3.21.1 | SUSE-SU-2025:4514-1 |
| SLES for SAP 15 SP4 | libsoup | 3.0.4-150400.3.21.1 | SUSE-SU-2025:4514-1 |
| SLES 16.0 | libsoup | 3.6.6-160000.1.1 | SUSE-SU-2026:20902-1 |
| SLE Micro 6.2 | libsoup | 3.6.6-160000.1.1 | SUSE-SU-2026:20752-1 |
| SLE Micro 6.1 | libsoup | 3.4.4-slfo.1.1_6.1 | SUSE-SU-2026:20360-1 |
| SLE Micro 6.0 | libsoup | 3.4.2-13.1 | SUSE-SU-2026:20529-1 |
| SLE HPC 15 SP5 | libsoup | 3.0.4-150400.3.21.1 | SUSE-SU-2025:4514-1 |
| SLE HPC 15 SP4 | libsoup | 3.0.4-150400.3.21.1 | SUSE-SU-2025:4514-1 |
| SUSE Manager Server LTS 4.3 | libsoup | 3.0.4-150400.3.21.1 | SUSE-SU-2025:4514-1 |
| SUSE Manager Proxy LTS 4.3 | libsoup | 3.0.4-150400.3.21.1 | SUSE-SU-2025:4514-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libsoup | 3.6.5-9.1 | openSUSE-SU-2025:15766-1 |
| openSUSE Leap 16.0 | libsoup | 3.6.6-160000.1.1 | openSUSE-SU-2026:20384-1 |
| openSUSE Leap 15.6 | libsoup | 3.4.4-150600.3.21.1 | SUSE-SU-2026:0017-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libsoup3 +2 | 3.6.5-53.amzn2023 | ALAS2023-2025-1288 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libsoup | 3.4.4-11 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | libsoup3 +2 | 3.6.5-3.el10_1.7 | ELSA-2025-23139 |
Advisories 17
- RHSA-2025:23437 Red Hat Security Advisory: libsoup3 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- ALSA-2025:23139 Moderate: libsoup3 security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-0489 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Oct 21, 2026
- WID-SEC-2025-2830 Red Hat Enterprise Linux (libsoup): Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Sep 17, 2026
- RHSA-2025:23139 Red Hat Security Advisory: libsoup3 security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- USN-7932-1 libsoup3 vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2026:20902-1 Security update for libsoup SUSE / openSUSE Security Updates · Apr 2, 2026
- openSUSE-SU-2026:20384-1 Security update for libsoup SUSE / openSUSE Security Updates · Mar 26, 2026
- SUSE-SU-2026:20752-1 Security update for libsoup SUSE / openSUSE Security Updates · Mar 25, 2026
- openSUSE-SU-2025:15766-1 libsoup-3_0-0-3.6.5-9.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20360-1 Security update for libsoup SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0017-1 Security update for libsoup SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4514-1 Security update for libsoup SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20529-1 Security update for libsoup SUSE / openSUSE Security Updates · Mar 4, 2026
- RLSA-2025:23139 Moderate: libsoup3 security update Rocky Linux Security Advisories · Dec 13, 2025
- ELSA-2025-23139 Moderate: libsoup3 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Dec 11, 2025
- ALAS2023-2025-1288 Important: libsoup3 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Dec 8, 2025
References
- RHSA-2025:23139 vendor-advisory
- RHSA-2025:23437 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2025-12105 vdb-entry
- RHBZ#2405992 issue-tracking
- https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/481