Description
A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 §5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update 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 9.2 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 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
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 +1 | No fix yet | — |
| Debian 12 | libsoup3 +1 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libsoup3 +1 | No fix yet | — |
| Ubuntu 26.04 LTS | libsoup3 | No fix yet | — |
| Ubuntu 24.04 LTS | libsoup3 +1 | No fix yet | — |
| Ubuntu 22.04 LTS | libsoup2.4 | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | libsoup2.4 | No fix yet | — |
| Ubuntu Pro 22.04 LTS | libsoup3 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | libsoup2.4 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | libsoup2.4 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | libsoup2.4 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | libsoup3 +2 | 3.6.5-3.el10_2.14 | RHSA-2026:98560, RHSA-2026:68235 |
| RHEL 9 | libsoup +1 | 2.72.0-16.el9_8.3 | RHSA-2026:98453, RHSA-2026:68234 |
| RHEL 8 | libsoup +1 | 2.62.3-15.el8_10 | RHSA-2026:68266 |
Show 10 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_0.17 | RHSA-2026:71389 |
| RHEL 9.6 EUS | libsoup +1 | 2.72.0-10.el9_6.9 | RHSA-2026:68612 |
| RHEL 9.4 E4S | libsoup +1 | 2.72.0-8.el9_4.12 | RHSA-2026:69108 |
| RHEL 9.2 E4S | libsoup +1 | 2.72.0-8.el9_2.13 | RHSA-2026:69297 |
| RHEL 8.8 TUS | libsoup +1 | 2.62.3-3.el8_8.11 | RHSA-2026:69863 |
| RHEL 8.8 E4S | libsoup +1 | 2.62.3-3.el8_8.11 | RHSA-2026:69863 |
| RHEL 8.6 EUS Long Life | libsoup +1 | 2.62.3-2.el8_6.10 | RHSA-2026:70598 |
| RHEL 8.6 AUS | libsoup +1 | 2.62.3-2.el8_6.10 | RHSA-2026:70598 |
| RHEL 8.4 EUS Long Life | libsoup +1 | 2.62.3-2.el8_4.10 | RHSA-2026:70599 |
| RHEL 8.4 AUS | libsoup +1 | 2.62.3-2.el8_4.10 | RHSA-2026:70599 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | libsoup3 +2 | 3.6.5-3.el10_2.14 | ALSA-2026:68235 |
| AlmaLinux 9 | libsoup +1 | 2.72.0-16.el9_8.3 | ALSA-2026:68234 |
| AlmaLinux 8 | libsoup +1 | 2.62.3-15.el8_10 | ALSA-2026:68266 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | libsoup3 +2 | 3.6.6-1.el10_3.9 | RLSA-2026:98560 |
| Rocky Linux 9 | libsoup | 2.72.0-16.el9_8.3 | RLSA-2026:98453, RLSA-2026:68234 |
| Rocky Linux 9 | libsoup-devel | 2.72.0-17.el9_9.6 | RLSA-2026:98453 |
| Rocky Linux 8 | libsoup | 2.62.3-15.el8_10 | RLSA-2026:68266 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libsoup | 3.4.4-150600.3.56.1 | SUSE-SU-2026:4558-1 |
| SLES 15 SP7 | libsoup2 | 2.74.3-150600.4.42.1 | SUSE-SU-2026:4703-1 |
| SLES 15 SP6 | libsoup | 3.4.4-150600.3.56.1 | SUSE-SU-2026:4558-1 |
| SLES 15 SP6 | libsoup2 | 2.74.3-150600.4.42.1 | SUSE-SU-2026:4703-1 |
| SLES 15 SP5 | libsoup | 3.0.4-150400.3.52.1 | SUSE-SU-2026:4557-1 |
| SLES 15 SP5 | libsoup2 | 2.74.3-150400.3.43.1 | SUSE-SU-2026:4739-1 |
| SLES 15 SP4 | libsoup | 3.0.4-150400.3.52.1 | SUSE-SU-2026:4557-1 |
| SLES 15 SP4 | libsoup2 | 2.74.3-150400.3.43.1 | SUSE-SU-2026:4739-1 |
| SLES 12 SP5 | libsoup | 2.62.2-5.49.1 | SUSE-SU-2026:4690-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libsoup | 3.6.6-160000.5.1 | SUSE-SU-2026:24470-1 |
| SLES for SAP 15 SP6 | libsoup | 3.4.4-150600.3.56.1 | SUSE-SU-2026:4558-1 |
| SLES for SAP 15 SP6 | libsoup2 | 2.74.3-150600.4.42.1 | SUSE-SU-2026:4703-1 |
| SLES for SAP 15 SP5 | libsoup | 3.0.4-150400.3.52.1 | SUSE-SU-2026:4557-1 |
| SLES for SAP 15 SP5 | libsoup2 | 2.74.3-150400.3.43.1 | SUSE-SU-2026:4739-1 |
| SLES for SAP 15 SP4 | libsoup | 3.0.4-150400.3.52.1 | SUSE-SU-2026:4557-1 |
| SLES for SAP 15 SP4 | libsoup2 | 2.74.3-150400.3.43.1 | SUSE-SU-2026:4739-1 |
| SLES 16.0 | libsoup | 3.6.6-160000.5.1 | SUSE-SU-2026:24470-1 |
| SLE Micro 6.0 | libsoup | 3.4.2-159998.1.1 | SUSE-SU-2026:24368-1 |
| SLE Micro 5.5 | libsoup2 | 2.74.3-150400.3.43.1 | SUSE-SU-2026:4739-1 |
| SLE Micro 5.4 | libsoup2 | 2.74.3-150400.3.43.1 | SUSE-SU-2026:4739-1 |
| SLE Micro 5.3 | libsoup2 | 2.74.3-150400.3.43.1 | SUSE-SU-2026:4739-1 |
| SLE HPC 15 SP5 | libsoup | 3.0.4-150400.3.52.1 | SUSE-SU-2026:4557-1 |
| SLE HPC 15 SP5 | libsoup2 | 2.74.3-150400.3.43.1 | SUSE-SU-2026:4739-1 |
| SLE HPC 15 SP4 | libsoup | 3.0.4-150400.3.52.1 | SUSE-SU-2026:4557-1 |
| SLE HPC 15 SP4 | libsoup2 | 2.74.3-150400.3.43.1 | SUSE-SU-2026:4739-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libsoup | 3.8.1-1.1 | openSUSE-SU-2026:12365-1 |
| openSUSE Tumbleweed | libsoup2 | 2.74.3-24.1 | openSUSE-SU-2026:12084-1 |
| openSUSE Leap 16.0 | libsoup | 3.6.6-160000.5.1 | openSUSE-SU-2026:22181-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libsoup +2 | 2.72.0-6.amzn2023.0.13 | ALAS2023-2026-2086 |
| Amazon Linux 2023 | libsoup3 +2 | 3.6.6-59.amzn2023 | ALAS2023-2026-2087 |
| Amazon Linux 2 | libsoup +1 | 2.56.0-6.amzn2.0.8 | ALAS2-2026-3876 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libsoup | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | libsoup3 +2 | 3.6.5-3.el10_2.14 | ELSA-2026-68235 |
| Oracle Linux 9 | libsoup +1 | 2.72.0-16.el9_8.3 | ELSA-2026-68234 |
| Oracle Linux 8 | libsoup +1 | 2.62.3-15.el8_10 | ELSA-2026-68266 |
Advisories 37
- RHSA-2026:98453 Red Hat Security Advisory: libsoup security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:98560 Red Hat Security Advisory: libsoup3 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RLSA-2026:98560 Important: libsoup3 security update Rocky Linux Security Advisories · Nov 13, 2026
- RLSA-2026:98453 Important: libsoup security update Rocky Linux Security Advisories · Nov 13, 2026
- WID-SEC-2026-3419 Red Hat Enterprise Linux (corosync, libevent, libsoup): Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- SUSE-SU-2026:24470-1 Security update for libsoup SUSE / openSUSE Security Updates · Nov 4, 2026
- openSUSE-SU-2026:22181-1 Security update for libsoup SUSE / openSUSE Security Updates · Oct 31, 2026
- openSUSE-SU-2026:12365-1 libsoup-3_0-0-3.8.1-1.1 on GA media SUSE / openSUSE Security Updates · Oct 31, 2026
- ALSA-2026:68234 Moderate: libsoup security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:68235 Important: libsoup3 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:68266 Moderate: libsoup security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-2919 IBM App Connect Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 27, 2026
- SUSE-SU-2026:24368-1 Security update for libsoup SUSE / openSUSE Security Updates · Oct 27, 2026
- SUSE-SU-2026:4739-1 Security update for libsoup2 SUSE / openSUSE Security Updates · Oct 20, 2026
- SUSE-SU-2026:4690-1 Security update for libsoup SUSE / openSUSE Security Updates · Oct 17, 2026
- SUSE-SU-2026:4703-1 Security update for libsoup2 SUSE / openSUSE Security Updates · Oct 17, 2026
- RHSA-2026:68235 Red Hat Security Advisory: libsoup3 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- openSUSE-SU-2026:12084-1 libsoup-2_4-1-2.74.3-24.1 on GA media SUSE / openSUSE Security Updates · Oct 9, 2026
- SUSE-SU-2026:4557-1 Security update for libsoup SUSE / openSUSE Security Updates · Oct 8, 2026
- SUSE-SU-2026:4558-1 Security update for libsoup SUSE / openSUSE Security Updates · Oct 8, 2026
- RHSA-2026:71389 Red Hat Security Advisory: libsoup3 security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:70598 Red Hat Security Advisory: libsoup security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:70599 Red Hat Security Advisory: libsoup security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:69863 Red Hat Security Advisory: libsoup security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:69297 Red Hat Security Advisory: libsoup security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:69108 Red Hat Security Advisory: libsoup security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:68612 Red Hat Security Advisory: libsoup security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:68266 Red Hat Security Advisory: libsoup security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:68234 Red Hat Security Advisory: libsoup security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RLSA-2026:68266 Moderate: libsoup security update Rocky Linux Security Advisories · Sep 17, 2026
- RLSA-2026:68234 Moderate: libsoup security update Rocky Linux Security Advisories · Sep 17, 2026
- ELSA-2026-68266 Moderate: libsoup security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 17, 2026
- ELSA-2026-68235 Important: libsoup3 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Sep 17, 2026
- ELSA-2026-68234 Moderate: libsoup security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 16, 2026
- ALAS2-2026-3876 Important: libsoup security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- ALAS2023-2026-2086 Important: libsoup security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- ALAS2023-2026-2087 Important: libsoup3 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
References
- RHSA-2026:68234 vendor-advisory
- RHSA-2026:68235 vendor-advisory
- RHSA-2026:68266 vendor-advisory
- RHSA-2026:68612 vendor-advisory
- RHSA-2026:69108 vendor-advisory
- RHSA-2026:69297 vendor-advisory
- RHSA-2026:69863 vendor-advisory
- RHSA-2026:70598 vendor-advisory
- RHSA-2026:70599 vendor-advisory
- RHSA-2026:71389 vendor-advisory
- RHSA-2026:98453 vendor-advisory
- RHSA-2026:98560 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-15711 vdb-entry
- RHBZ#2499924 issue-tracking
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/515