# CVE-2026-4367: Libxpm: libxpm: denial of service via out-of-bounds read in xpm file parsing

CVE-2026-4367 is fixed in 8 products on 1 platform, first by libxpm4 1:3.5.12-1ubuntu0.22.04.3, released April 21, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-4367
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 21, 2026
- Weakness: Out-of-bounds Read
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-4367

## Description

A flaw was found in libXpm. A local user with low privileges could exploit an Out-of-Bounds Read vulnerability in the `xpmNextWord()` function by processing a specially crafted or very small XPM (X PixMap) image file. This improper validation of file boundaries can cause an internal pointer to read beyond the file's end, leading to application crashes and Denial of Service conditions.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libXpm amzn 2023 | 3.5.17-3.amzn2023.0.2 | [ALAS2023-2026-1656](https://patchblox.com/security/data/fix/linux/alas2023-2026-1656.md) | May 11, 2026 |
| Linux | libXpm opensuse-leap 16.0 | 3.5.17-160000.3.1 | [OPENSUSE-SU-2026:20953-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20953-1.md) | Jun 11, 2026 |
| Linux | libXpm sles 16.0 | 3.5.17-160000.3.1 | [SUSE-SU-2026:22121-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22121-1.md) | Jun 11, 2026 |
| Linux | libXpm-debuginfo amzn 2023 | 3.5.17-3.amzn2023.0.2 | [ALAS2023-2026-1656](https://patchblox.com/security/data/fix/linux/alas2023-2026-1656.md) | May 11, 2026 |
| Linux | libXpm-debugsource amzn 2023 | 3.5.17-3.amzn2023.0.2 | [ALAS2023-2026-1656](https://patchblox.com/security/data/fix/linux/alas2023-2026-1656.md) | May 11, 2026 |
| Linux | libXpm-devel amzn 2023 | 3.5.17-3.amzn2023.0.2 | [ALAS2023-2026-1656](https://patchblox.com/security/data/fix/linux/alas2023-2026-1656.md) | May 11, 2026 |
| Linux | libXpm-devel-debuginfo amzn 2023 | 3.5.17-3.amzn2023.0.2 | [ALAS2023-2026-1656](https://patchblox.com/security/data/fix/linux/alas2023-2026-1656.md) | May 11, 2026 |
| Linux | libxpm Debian 13.5 (trixie) | 1:3.5.17-1+deb13u1 | [DEBIAN-CVE-2026-4367](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4367.md) | May 15, 2026 |
| Linux | libxpm Debian 14 | 1:3.5.19-1 | [DEBIAN-CVE-2026-4367](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4367.md) | May 15, 2026 |
| Linux | libxpm4 Ubuntu 22.04.1 LTS (jammy) | 1:3.5.12-1ubuntu0.22.04.3 | [libxpm4 1:3.5.12-1ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libxpm4-1-3.5.12-1ubuntu0.22.04.3.md) | Apr 21, 2026 |
| Linux | libxpm4 Ubuntu 24.04.5 LTS (noble) | 1:3.5.17-1ubuntu0.24.04.1 | [libxpm4 1:3.5.17-1ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libxpm4-1-3.5.17-1ubuntu0.24.04.1.md) | Apr 21, 2026 |
| Linux | libxpm4 Ubuntu 26.04.1 LTS (resolute) | 1:3.5.17-1ubuntu0.26.04.1 | [libxpm4 1:3.5.17-1ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libxpm4-1-3.5.17-1ubuntu0.26.04.1.md) | Apr 21, 2026 |
| Linux | xpmutils Ubuntu 22.04.1 LTS (jammy) | 1:3.5.12-1ubuntu0.22.04.3 | [xpmutils 1:3.5.12-1ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xpmutils-1-3.5.12-1ubuntu0.22.04.3.md) | Apr 21, 2026 |
| Linux | xpmutils Ubuntu 24.04.5 LTS (noble) | 1:3.5.17-1ubuntu0.24.04.1 | [xpmutils 1:3.5.17-1ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-xpmutils-1-3.5.17-1ubuntu0.24.04.1.md) | Apr 21, 2026 |
| Linux | xpmutils Ubuntu 26.04.1 LTS (resolute) | 1:3.5.17-1ubuntu0.26.04.1 | [xpmutils 1:3.5.17-1ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-xpmutils-1-3.5.17-1ubuntu0.26.04.1.md) | Apr 21, 2026 |

---

Data as of 2026-11-07T18:46:35Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.