Description
An out-of-bounds read in libXtst's RECORD reply parser in libXtst before 1.2.6 could be used by malicious X servers to crash attached X clients.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| x.org | libXtst | < 1.2.6 | 1.2.6 |
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 14 | libxtst | 2:1.2.6-1 | — |
| Debian 13 | libxtst | No fix yet | — |
| Debian 12 | libxtst | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libxtst | 2:1.2.5-1ubuntu1 | USN-8939-1 |
| Ubuntu 26.04 LTS | libxtst | 2:1.2.5-1ubuntu0.1 | USN-8939-1 |
| Ubuntu 24.04 LTS | libxtst | 2:1.2.3-1.1ubuntu0.1 | USN-8939-1 |
| Ubuntu 22.04 LTS | libxtst | 2:1.2.3-1ubuntu0.22.04.1 | USN-8939-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libxtst | 2:1.2.3-1ubuntu0.20.04.1~esm1 | USN-8939-1 |
| Ubuntu Pro 18.04 LTS | libxtst | 2:1.2.3-1ubuntu0.18.04.1~esm1 | USN-8939-1 |
| Ubuntu Pro 16.04 LTS | libxtst | 2:1.2.2-1ubuntu0.1~esm1 | USN-8939-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | libXtst +1 | 1.2.5-5.1.hum1 | RHSA-2026:79192 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | libXtst +1 | 1.2.4-8.el10_2.1 | ALSA-2026:91612 |
| AlmaLinux 9 | libXtst +1 | 1.2.3-16.el9_8.1 | ALSA-2026:91223 |
| AlmaLinux 8 | libXtst +1 | 1.2.3-8.el8_10 | ALSA-2026:91294 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | libXtst +1 | 1.2.4-8.el10_2.1 | RLSA-2026:98604, RLSA-2026:91612 |
| Rocky Linux 9 | libXtst | 1.2.3-16.el9_8.1 | RLSA-2026:98499, RLSA-2026:91223 |
| Rocky Linux 8 | libXtst | 1.2.3-8.el8_10 | RLSA-2026:91294 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libXtst | 1.2.3-150000.3.3.1 | SUSE-SU-2026:4566-1 |
| SLES 15 SP6 | libXtst | 1.2.3-150000.3.3.1 | SUSE-SU-2026:4566-1 |
| SLES 15 SP5 | libXtst | 1.2.3-150000.3.3.1 | SUSE-SU-2026:4566-1 |
| SLES 15 SP4 | libXtst | 1.2.3-150000.3.3.1 | SUSE-SU-2026:4566-1 |
| SLES 12 SP5 | libXtst | 1.2.2-8.3.1 | SUSE-SU-2026:4565-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libXtst | 1.2.5-160000.4.1 | SUSE-SU-2026:24145-1 |
| SLES for SAP 15 SP6 | libXtst | 1.2.3-150000.3.3.1 | SUSE-SU-2026:4566-1 |
| SLES for SAP 15 SP5 | libXtst | 1.2.3-150000.3.3.1 | SUSE-SU-2026:4566-1 |
| SLES for SAP 15 SP4 | libXtst | 1.2.3-150000.3.3.1 | SUSE-SU-2026:4566-1 |
| SLES 16.0 | libXtst | 1.2.5-160000.4.1 | SUSE-SU-2026:24145-1 |
| SLE Micro 5.5 | libXtst | 1.2.3-150000.3.3.1 | SUSE-SU-2026:4566-1 |
| SLE Micro 5.4 | libXtst | 1.2.3-150000.3.3.1 | SUSE-SU-2026:4566-1 |
| SLE Micro 5.3 | libXtst | 1.2.3-150000.3.3.1 | SUSE-SU-2026:4566-1 |
| SLE HPC 15 SP5 | libXtst | 1.2.3-150000.3.3.1 | SUSE-SU-2026:4566-1 |
| SLE HPC 15 SP4 | libXtst | 1.2.3-150000.3.3.1 | SUSE-SU-2026:4566-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libXtst | 1.2.5-2.1 | openSUSE-SU-2026:11897-1 |
| openSUSE Leap 16.0 | libXtst | 1.2.5-160000.4.1 | openSUSE-SU-2026:22031-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libxtst | 1.2.6-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libXtst +1 | 1.2.5-1.amzn2023.0.2 | ALAS2023-2026-3259 |
| Amazon Linux 2 | libXtst +1 | 1.2.3-1.amzn2.0.3 | ALAS2-2026-4012 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libXtst | 1.2.6-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | libXtst +1 | 1.2.4-8.el10_2.1 | ELSA-2026-91612 |
| Oracle Linux 9 | libXtst +1 | 1.2.3-16.el9_8.1 | ELSA-2026-91223 |
| Oracle Linux 8 | libXtst +1 | 1.2.3-8.el8_10 | ELSA-2026-91294 |
Advisories 21
- RLSA-2026:98604 Important: libXtst security update Rocky Linux Security Advisories · Nov 13, 2026
- WID-SEC-2026-4187 Red Hat Enterprise Linux (libXi, libXrender, ansible-collection-redhat-leapp) und Red Hat Build of Apache Camel for Quarkus: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- RLSA-2026:98499 Important: libXtst security update Rocky Linux Security Advisories · Nov 12, 2026
- RLSA-2026:91223 Important: libXtst security update Rocky Linux Security Advisories · Oct 30, 2026
- ALSA-2026:91223 Important: libXtst security update AlmaLinux Security Advisories · Oct 29, 2026
- RLSA-2026:91294 Important: libXtst security update Rocky Linux Security Advisories · Oct 29, 2026
- RLSA-2026:91612 Important: libXtst security update Rocky Linux Security Advisories · Oct 29, 2026
- ALSA-2026:91612 Important: libXtst security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:91294 Important: libXtst security update AlmaLinux Security Advisories · Oct 29, 2026
- ELSA-2026-91223 Important: libXtst security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 29, 2026
- ELSA-2026-91612 Important: libXtst security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Oct 28, 2026
- ELSA-2026-91294 Important: libXtst security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 27, 2026
- ALAS2023-2026-3259 Important: libXtst security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- ALAS2-2026-4012 Important: libXtst security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- USN-8939-1 libxtst vulnerabilities Ubuntu Security Notices (USN) · Oct 20, 2026
- SUSE-SU-2026:24145-1 Security update for libXtst SUSE / openSUSE Security Updates · Oct 16, 2026
- RHSA-2026:79192 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- openSUSE-SU-2026:22031-1 Security update for libXtst SUSE / openSUSE Security Updates · Oct 9, 2026
- SUSE-SU-2026:4565-1 Security update for libXtst SUSE / openSUSE Security Updates · Oct 8, 2026
- SUSE-SU-2026:4566-1 Security update for libXtst SUSE / openSUSE Security Updates · Oct 8, 2026
- openSUSE-SU-2026:11897-1 libXtst-devel-1.2.5-2.1 on GA media SUSE / openSUSE Security Updates · Sep 29, 2026