# CVE-2026-94283: Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser

CVE-2026-94283 is fixed in 5 products on 1 platform, first by libx11-6 2:1.8.13-1ubuntu0.1, released September 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-94283
- Priority: Routine
- CVSS: 6.5 (Moderate)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 28, 2026
- Weakness: Out-of-bounds Read
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-94283

## Description

An out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libX11 opensuse-leap 16.0 | 1.8.10-160000.5.1 | [OPENSUSE-SU-2026:22055-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22055-1.md) | Nov 7, 2026 |
| Linux | libX11 sles 15.6 | 1.8.7-150600.3.11.1 | [SUSE-SU-2026:4501-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4501-1.md) | Oct 5, 2026 |
| Linux | libX11 sles 15.7 | 1.8.10-150700.4.8.1 | [SUSE-SU-2026:4502-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4502-1.md) | Oct 5, 2026 |
| Linux | libX11 sles 16.0 | 1.8.10-160000.5.1 | [SUSE-SU-2026:24201-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24201-1.md) | Nov 7, 2026 |
| Linux | libx11 Debian 14 | 2:1.8.14-1 | [DEBIAN-CVE-2026-94283](https://patchblox.com/security/data/fix/linux/debian-cve-2026-94283.md) | Sep 28, 2026 |
| Linux | libx11-6 Ubuntu 18.04.6 LTS (bionic) | 2:1.6.4-3ubuntu0.4+esm3 | [libx11-6 2:1.6.4-3ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libx11-6-2-1.6.4-3ubuntu0.4-esm3.md) | Oct 13, 2026 |
| Linux | libx11-6 Ubuntu 20.04 LTS (focal) | 2:1.6.9-2ubuntu1.6+esm1 | [libx11-6 2:1.6.9-2ubuntu1.6+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libx11-6-2-1.6.9-2ubuntu1.6-esm1.md) | Oct 13, 2026 |
| Linux | libx11-6 Ubuntu 22.04.1 LTS (jammy) | 2:1.7.5-1ubuntu0.4 | [libx11-6 2:1.7.5-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libx11-6-2-1.7.5-1ubuntu0.4.md) | Oct 13, 2026 |
| Linux | libx11-6 Ubuntu 24.04.5 LTS (noble) | 2:1.8.7-1ubuntu0.1 | [libx11-6 2:1.8.7-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libx11-6-2-1.8.7-1ubuntu0.1.md) | Oct 13, 2026 |
| Linux | libx11-6 Ubuntu 26.04.1 LTS (resolute) | 2:1.8.13-1ubuntu0.1 | [libx11-6 2:1.8.13-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libx11-6-2-1.8.13-1ubuntu0.1.md) | Sep 28, 2026 |
| Linux | libx11-data Ubuntu 18.04.6 LTS (bionic) | 2:1.6.4-3ubuntu0.4+esm3 | [libx11-data 2:1.6.4-3ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libx11-data-2-1.6.4-3ubuntu0.4-esm3.md) | Oct 13, 2026 |
| Linux | libx11-data Ubuntu 20.04 LTS (focal) | 2:1.6.9-2ubuntu1.6+esm1 | [libx11-data 2:1.6.9-2ubuntu1.6+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libx11-data-2-1.6.9-2ubuntu1.6-esm1.md) | Oct 13, 2026 |
| Linux | libx11-data Ubuntu 22.04.1 LTS (jammy) | 2:1.7.5-1ubuntu0.4 | [libx11-data 2:1.7.5-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libx11-data-2-1.7.5-1ubuntu0.4.md) | Oct 13, 2026 |
| Linux | libx11-data Ubuntu 24.04.5 LTS (noble) | 2:1.8.7-1ubuntu0.1 | [libx11-data 2:1.8.7-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libx11-data-2-1.8.7-1ubuntu0.1.md) | Oct 13, 2026 |
| Linux | libx11-data Ubuntu 26.04.1 LTS (resolute) | 2:1.8.13-1ubuntu0.1 | [libx11-data 2:1.8.13-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libx11-data-2-1.8.13-1ubuntu0.1.md) | Sep 28, 2026 |
| Linux | libx11-xcb1 Ubuntu 18.04.6 LTS (bionic) | 2:1.6.4-3ubuntu0.4+esm3 | [libx11-xcb1 2:1.6.4-3ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libx11-xcb1-2-1.6.4-3ubuntu0.4-esm3.md) | Oct 13, 2026 |
| Linux | libx11-xcb1 Ubuntu 20.04 LTS (focal) | 2:1.6.9-2ubuntu1.6+esm1 | [libx11-xcb1 2:1.6.9-2ubuntu1.6+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libx11-xcb1-2-1.6.9-2ubuntu1.6-esm1.md) | Oct 13, 2026 |
| Linux | libx11-xcb1 Ubuntu 22.04.1 LTS (jammy) | 2:1.7.5-1ubuntu0.4 | [libx11-xcb1 2:1.7.5-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libx11-xcb1-2-1.7.5-1ubuntu0.4.md) | Oct 13, 2026 |
| Linux | libx11-xcb1 Ubuntu 24.04.5 LTS (noble) | 2:1.8.7-1ubuntu0.1 | [libx11-xcb1 2:1.8.7-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libx11-xcb1-2-1.8.7-1ubuntu0.1.md) | Oct 13, 2026 |
| Linux | libx11-xcb1 Ubuntu 26.04.1 LTS (resolute) | 2:1.8.13-1ubuntu0.1 | [libx11-xcb1 2:1.8.13-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libx11-xcb1-2-1.8.13-1ubuntu0.1.md) | Sep 28, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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