# CVE-2026-94286: Out-of-bounds read in libXtst's RECORD reply parser CVE-2026-94286 is fixed in 6 products on 1 platform, first by libxtst6 2:1.2.5-1ubuntu0.1, released September 28, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-94286 - Priority: High - CVSS: 7.1 (Important) - EPSS: 0.0020 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 28, 2026 - Weakness: Buffer Over-read - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-94286 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libXtst RHEL 10 | 1.2.4-8.el10_0.1 | [RHSA-2026:93448](https://patchblox.com/security/data/fix/linux/rhsa-2026-93448.md) | Sep 28, 2026 | | Linux | libXtst RHEL 8 | 0:1.2.3-8.el8_10 | [RHSA-2026:91294](https://patchblox.com/security/data/fix/linux/rhsa-2026-91294.md) | Oct 29, 2026 | | Linux | libXtst RHEL 9 | 0:1.2.3-16.el9_8.1 | [RHSA-2026:91223](https://patchblox.com/security/data/fix/linux/rhsa-2026-91223.md) | Oct 30, 2026 | | Linux | libXtst almalinux 10 | 1.2.4-8.el10_2.1 | [ALSA-2026:91612](https://patchblox.com/security/data/fix/linux/alsa-2026-91612.md) | Nov 7, 2026 | | Linux | libXtst almalinux 8 | 1.2.3-8.el8_10 | [ALSA-2026:91294](https://patchblox.com/security/data/fix/linux/alsa-2026-91294.md) | Nov 7, 2026 | | Linux | libXtst almalinux 9 | 1.2.3-16.el9_8.1 | [ALSA-2026:91223](https://patchblox.com/security/data/fix/linux/alsa-2026-91223.md) | Nov 7, 2026 | | Linux | libXtst amzn 2023 | 1.2.5-1.amzn2023.0.2 | [ALAS2023-2026-3259](https://patchblox.com/security/data/fix/linux/alas2023-2026-3259.md) | Nov 7, 2026 | | Linux | libXtst ol 10 | 0:1.2.4-8.el10_2.1 | [ELSA-2026-91612](https://patchblox.com/security/data/fix/linux/elsa-2026-91612.md) | Nov 7, 2026 | | Linux | libXtst ol 8 | 0:1.2.3-8.el8_10 | [ELSA-2026-91294](https://patchblox.com/security/data/fix/linux/elsa-2026-91294.md) | Nov 7, 2026 | | Linux | libXtst ol 9 | 0:1.2.3-16.el9_8.1 | [ELSA-2026-91223](https://patchblox.com/security/data/fix/linux/elsa-2026-91223.md) | Nov 7, 2026 | | Linux | libXtst opensuse-leap 16.0 | 1.2.5-160000.4.1 | [OPENSUSE-SU-2026:22031-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22031-1.md) | Oct 6, 2026 | | Linux | libXtst rocky 10 | 0:1.2.4-8.el10_2.1 | [RLSA-2026:91612](https://patchblox.com/security/data/fix/linux/rlsa-2026-91612.md) | Nov 7, 2026 | | Linux | libXtst rocky 8 | 0:1.2.3-8.el8_10 | [RLSA-2026:91294](https://patchblox.com/security/data/fix/linux/rlsa-2026-91294.md) | Nov 7, 2026 | | Linux | libXtst rocky 9 | 0:1.2.3-16.el9_8.1 | [RLSA-2026:91223](https://patchblox.com/security/data/fix/linux/rlsa-2026-91223.md) | Nov 7, 2026 | | Linux | libXtst sles 15.6 | 1.2.3-150000.3.3.1 | [SUSE-SU-2026:4566-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4566-1.md) | Oct 7, 2026 | | Linux | libXtst sles 15.7 | 1.2.3-150000.3.3.1 | [SUSE-SU-2026:4566-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4566-1.md) | Oct 7, 2026 | | Linux | libXtst sles 16.0 | 1.2.5-160000.4.1 | [SUSE-SU-2026:24145-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24145-1.md) | Oct 6, 2026 | | Linux | libXtst-debuginfo amzn 2023 | 1.2.5-1.amzn2023.0.2 | [ALAS2023-2026-3259](https://patchblox.com/security/data/fix/linux/alas2023-2026-3259.md) | Nov 7, 2026 | | Linux | libXtst-debugsource amzn 2023 | 1.2.5-1.amzn2023.0.2 | [ALAS2023-2026-3259](https://patchblox.com/security/data/fix/linux/alas2023-2026-3259.md) | Nov 7, 2026 | | Linux | libXtst-devel RHEL 8 | 0:1.2.3-8.el8_10 | [RHSA-2026:91294](https://patchblox.com/security/data/fix/linux/rhsa-2026-91294.md) | Oct 29, 2026 | | Linux | libXtst-devel RHEL 9 | 0:1.2.3-16.el9_8.1 | [RHSA-2026:91223](https://patchblox.com/security/data/fix/linux/rhsa-2026-91223.md) | Oct 30, 2026 | | Linux | libXtst-devel almalinux 10 | 1.2.4-8.el10_2.1 | [ALSA-2026:91612](https://patchblox.com/security/data/fix/linux/alsa-2026-91612.md) | Nov 7, 2026 | | Linux | libXtst-devel almalinux 8 | 1.2.3-8.el8_10 | [ALSA-2026:91294](https://patchblox.com/security/data/fix/linux/alsa-2026-91294.md) | Nov 7, 2026 | | Linux | libXtst-devel almalinux 9 | 1.2.3-16.el9_8.1 | [ALSA-2026:91223](https://patchblox.com/security/data/fix/linux/alsa-2026-91223.md) | Nov 7, 2026 | | Linux | libXtst-devel amzn 2023 | 1.2.5-1.amzn2023.0.2 | [ALAS2023-2026-3259](https://patchblox.com/security/data/fix/linux/alas2023-2026-3259.md) | Nov 7, 2026 | | Linux | libXtst-devel ol 10 | 0:1.2.4-8.el10_2.1 | [ELSA-2026-91612](https://patchblox.com/security/data/fix/linux/elsa-2026-91612.md) | Nov 7, 2026 | | Linux | libXtst-devel ol 8 | 0:1.2.3-8.el8_10 | [ELSA-2026-91294](https://patchblox.com/security/data/fix/linux/elsa-2026-91294.md) | Nov 7, 2026 | | Linux | libXtst-devel ol 9 | 0:1.2.3-16.el9_8.1 | [ELSA-2026-91223](https://patchblox.com/security/data/fix/linux/elsa-2026-91223.md) | Nov 7, 2026 | | Linux | libxtst Debian 14 | 2:1.2.6-1 | [DEBIAN-CVE-2026-94286](https://patchblox.com/security/data/fix/linux/debian-cve-2026-94286.md) | Sep 28, 2026 | | Linux | libxtst6 Ubuntu 18.04.6 LTS (bionic) | 2:1.2.3-1ubuntu0.18.04.1~esm1 | [libxtst6 2:1.2.3-1ubuntu0.18.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libxtst6-2-1.2.3-1ubuntu0.18.04.1-esm1.md) | Oct 21, 2026 | | Linux | libxtst6 Ubuntu 20.04 LTS (focal) | 2:1.2.3-1ubuntu0.20.04.1~esm1 | [libxtst6 2:1.2.3-1ubuntu0.20.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libxtst6-2-1.2.3-1ubuntu0.20.04.1-esm1.md) | Oct 21, 2026 | | Linux | libxtst6 Ubuntu 22.04.1 LTS (jammy) | 2:1.2.3-1ubuntu0.22.04.1 | [libxtst6 2:1.2.3-1ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libxtst6-2-1.2.3-1ubuntu0.22.04.1.md) | Oct 21, 2026 | | Linux | libxtst6 Ubuntu 24.04.5 LTS (noble) | 2:1.2.3-1.1ubuntu0.1 | [libxtst6 2:1.2.3-1.1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libxtst6-2-1.2.3-1.1ubuntu0.1.md) | Oct 21, 2026 | | Linux | libxtst6 Ubuntu 26.04.1 LTS (resolute) | 2:1.2.5-1ubuntu0.1 | [libxtst6 2:1.2.5-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libxtst6-2-1.2.5-1ubuntu0.1.md) | Sep 28, 2026 | --- Data as of 2026-11-08T06:59:42Z UTC. 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