CVE-2026-88806
libX11 XkbGetMap Reply Heap-based Buffer Overflow
CVE-2026-88806 is fixed in 11 products on 1 platform, first by RHSA-2026:95499, released September 21, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0020
10th percentile
A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libX11 · RHEL 10 | 1.8.10-1.el10_0.1 | RHSA-2026:95499 | Sep 21, 2026 |
| libX11 · RHEL 8 | 0:1.6.8-10.el8_10 | RHSA-2026:89730 | Oct 27, 2026 |
| libX11 · RHEL 9 | 0:1.8.12-1.el9_8.1 | RHSA-2026:91365 | Oct 30, 2026 |
| libX11 · almalinux 10 | 1.8.10-1.el10_2.1 | ALSA-2026:91366 | Nov 7, 2026 |
| libX11 · almalinux 8 | 1.6.8-10.el8_10 | ALSA-2026:89730 | Nov 7, 2026 |
| libX11 · almalinux 9 | 1.8.12-1.el9_8.1 | ALSA-2026:91365 | Nov 7, 2026 |
| libX11 · amzn 2023 | 1.8.10-2.amzn2023.0.2 | ALAS2023-2026-3179 | Nov 7, 2026 |
| libX11 · ol 10 | 0:1.8.10-1.el10_2.1 | ELSA-2026-91366 | Nov 7, 2026 |
| libX11 · ol 8 | 0:1.6.8-10.el8_10 | ELSA-2026-89730 | Nov 7, 2026 |
| libX11 · ol 9 | 0:1.8.12-1.el9_8.1 | ELSA-2026-91365 | Nov 7, 2026 |
| libX11 · opensuse-leap 16.0 | 1.8.10-160000.4.1 | OPENSUSE-SU-2026:21908-1 | Sep 22, 2026 |
| libX11 · rocky 10 | 0:1.8.10-1.el10_2.1 | RLSA-2026:91366 | Nov 7, 2026 |
| libX11 · rocky 8 | 0:1.6.8-10.el8_10 | RLSA-2026:89730 | Nov 7, 2026 |
| libX11 · rocky 9 | 0:1.8.12-1.el9_8.1 | RLSA-2026:91365 | Nov 7, 2026 |
| libX11 · sles 15.6 | 1.8.7-150600.3.11.1 | SUSE-SU-2026:4501-1 | Oct 5, 2026 |
| libX11 · sles 15.7 | 1.8.10-150700.4.8.1 | SUSE-SU-2026:4502-1 | Oct 5, 2026 |
| libX11 · sles 16.0 | 1.8.10-160000.4.1 | SUSE-SU-2026:23899-1 | Sep 22, 2026 |
| libX11-common · RHEL 8 | 0:1.6.8-10.el8_10 | RHSA-2026:89730 | Oct 27, 2026 |
| libX11-common · RHEL 9 | 0:1.8.12-1.el9_8.1 | RHSA-2026:91365 | Oct 30, 2026 |
| libX11-common · almalinux 10 | 1.8.10-1.el10_2.1 | ALSA-2026:91366 | Nov 7, 2026 |
| libX11-common · almalinux 8 | 1.6.8-10.el8_10 | ALSA-2026:89730 | Nov 7, 2026 |
| libX11-common · almalinux 9 | 1.8.12-1.el9_8.1 | ALSA-2026:91365 | Nov 7, 2026 |
| libX11-common · amzn 2023 | 1.8.10-2.amzn2023.0.2 | ALAS2023-2026-3179 | Nov 7, 2026 |
| libX11-common · ol 10 | 0:1.8.10-1.el10_2.1 | ELSA-2026-91366 | Nov 7, 2026 |
| libX11-common · ol 8 | 0:1.6.8-10.el8_10 | ELSA-2026-89730 | Nov 7, 2026 |
| libX11-common · ol 9 | 0:1.8.12-1.el9_8.1 | ELSA-2026-91365 | Nov 7, 2026 |
| libX11-debuginfo · amzn 2023 | 1.8.10-2.amzn2023.0.2 | ALAS2023-2026-3179 | Nov 7, 2026 |
| libX11-debugsource · amzn 2023 | 1.8.10-2.amzn2023.0.2 | ALAS2023-2026-3179 | Nov 7, 2026 |
| libX11-devel · RHEL 8 | 0:1.6.8-10.el8_10 | RHSA-2026:89730 | Oct 27, 2026 |
| libX11-devel · RHEL 9 | 0:1.8.12-1.el9_8.1 | RHSA-2026:91365 | Oct 30, 2026 |
| libX11-devel · almalinux 10 | 1.8.10-1.el10_2.1 | ALSA-2026:91366 | Nov 7, 2026 |
| libX11-devel · almalinux 8 | 1.6.8-10.el8_10 | ALSA-2026:89730 | Nov 7, 2026 |
| libX11-devel · almalinux 9 | 1.8.12-1.el9_8.1 | ALSA-2026:91365 | Nov 7, 2026 |
| libX11-devel · amzn 2023 | 1.8.10-2.amzn2023.0.2 | ALAS2023-2026-3179 | Nov 7, 2026 |
| libX11-devel · ol 10 | 0:1.8.10-1.el10_2.1 | ELSA-2026-91366 | Nov 7, 2026 |
| libX11-devel · ol 8 | 0:1.6.8-10.el8_10 | ELSA-2026-89730 | Nov 7, 2026 |
| libX11-devel · ol 9 | 0:1.8.12-1.el9_8.1 | ELSA-2026-91365 | Nov 7, 2026 |
| libX11-xcb · RHEL 8 | 0:1.6.8-10.el8_10 | RHSA-2026:89730 | Oct 27, 2026 |
| libX11-xcb · RHEL 9 | 0:1.8.12-1.el9_8.1 | RHSA-2026:91365 | Oct 30, 2026 |
| libX11-xcb · almalinux 10 | 1.8.10-1.el10_2.1 | ALSA-2026:91366 | Nov 7, 2026 |
| libX11-xcb · almalinux 8 | 1.6.8-10.el8_10 | ALSA-2026:89730 | Nov 7, 2026 |
| libX11-xcb · almalinux 9 | 1.8.12-1.el9_8.1 | ALSA-2026:91365 | Nov 7, 2026 |
| libX11-xcb · amzn 2023 | 1.8.10-2.amzn2023.0.2 | ALAS2023-2026-3179 | Nov 7, 2026 |
| libX11-xcb · ol 10 | 0:1.8.10-1.el10_2.1 | ELSA-2026-91366 | Nov 7, 2026 |
| libX11-xcb · ol 8 | 0:1.6.8-10.el8_10 | ELSA-2026-89730 | Nov 7, 2026 |
| libX11-xcb · ol 9 | 0:1.8.12-1.el9_8.1 | ELSA-2026-91365 | Nov 7, 2026 |
| libX11-xcb-debuginfo · amzn 2023 | 1.8.10-2.amzn2023.0.2 | ALAS2023-2026-3179 | Nov 7, 2026 |
| libx11 · Debian 14 | 2:1.8.14-1 | DEBIAN-CVE-2026-88806 | Sep 21, 2026 |
| libx11-6 · Ubuntu 18.04.6 LTS (bionic) | 2:1.6.4-3ubuntu0.4+esm3 | libx11-6 2:1.6.4-3ubuntu0.4+esm3 | Oct 13, 2026 |
| libx11-6 · Ubuntu 20.04 LTS (focal) | 2:1.6.9-2ubuntu1.6+esm1 | libx11-6 2:1.6.9-2ubuntu1.6+esm1 | Oct 13, 2026 |
| libx11-6 · Ubuntu 22.04.1 LTS (jammy) | 2:1.7.5-1ubuntu0.4 | libx11-6 2:1.7.5-1ubuntu0.4 | Oct 13, 2026 |
| libx11-6 · Ubuntu 24.04.5 LTS (noble) | 2:1.8.7-1ubuntu0.1 | libx11-6 2:1.8.7-1ubuntu0.1 | Oct 13, 2026 |
| libx11-6 · Ubuntu 26.04.1 LTS (resolute) | 2:1.8.13-1ubuntu0.1 | libx11-6 2:1.8.13-1ubuntu0.1 | Sep 28, 2026 |
| libx11-data · Ubuntu 18.04.6 LTS (bionic) | 2:1.6.4-3ubuntu0.4+esm3 | libx11-data 2:1.6.4-3ubuntu0.4+esm3 | Oct 13, 2026 |
| libx11-data · Ubuntu 20.04 LTS (focal) | 2:1.6.9-2ubuntu1.6+esm1 | libx11-data 2:1.6.9-2ubuntu1.6+esm1 | Oct 13, 2026 |
| libx11-data · Ubuntu 22.04.1 LTS (jammy) | 2:1.7.5-1ubuntu0.4 | libx11-data 2:1.7.5-1ubuntu0.4 | Oct 13, 2026 |
| libx11-data · Ubuntu 24.04.5 LTS (noble) | 2:1.8.7-1ubuntu0.1 | libx11-data 2:1.8.7-1ubuntu0.1 | Oct 13, 2026 |
| libx11-data · Ubuntu 26.04.1 LTS (resolute) | 2:1.8.13-1ubuntu0.1 | libx11-data 2:1.8.13-1ubuntu0.1 | Sep 28, 2026 |
| libx11-xcb1 · Ubuntu 18.04.6 LTS (bionic) | 2:1.6.4-3ubuntu0.4+esm3 | libx11-xcb1 2:1.6.4-3ubuntu0.4+esm3 | Oct 13, 2026 |
| libx11-xcb1 · Ubuntu 20.04 LTS (focal) | 2:1.6.9-2ubuntu1.6+esm1 | libx11-xcb1 2:1.6.9-2ubuntu1.6+esm1 | Oct 13, 2026 |
| libx11-xcb1 · Ubuntu 22.04.1 LTS (jammy) | 2:1.7.5-1ubuntu0.4 | libx11-xcb1 2:1.7.5-1ubuntu0.4 | Oct 13, 2026 |
| libx11-xcb1 · Ubuntu 24.04.5 LTS (noble) | 2:1.8.7-1ubuntu0.1 | libx11-xcb1 2:1.8.7-1ubuntu0.1 | Oct 13, 2026 |
| libx11-xcb1 · Ubuntu 26.04.1 LTS (resolute) | 2:1.8.13-1ubuntu0.1 | libx11-xcb1 2:1.8.13-1ubuntu0.1 | Sep 28, 2026 |
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