---
id: "CVE-2026-93522"
kind: "vulnerability"
aliases: ["CVE-2026-93522"]
title: "X.Org X Server: CopyArea heap overflow lets clients crash or run code"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["linux-desktop", "runtime", "self-hosted", "x11", "xwayland"]
not_affected_if: ["fixed-version", "no-x-server"]
published_at: "2026-10-28T16:17:10+00:00"
first_seen_at: "2026-10-28T16:33:49+00:00"
updated_at: "2026-10-28T16:35:49+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93522", "first_seen_at": "2026-10-28T16:33:49+00:00"}]
---

# X.Org X Server: CopyArea heap overflow lets clients crash or run code

A size mismatch in the CopyArea CPU-to-FBO path of X.Org X Server and XWayland causes a heap buffer overflow. An authenticated X client can crash the server or potentially execute code in the X server context.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- `Xorg -version` or `X -version` to read the installed X.Org server version
- `Xwayland -version` to read the installed XWayland version
- Check whether the server is older than `21.1.15` (X.Org) or `24.1.14` (XWayland)

## Fix

- Upgrade the X.Org X Server to `21.1.15` or later
- Upgrade XWayland to `24.1.14` or later
- Install the fixed build from your distribution's package manager

## Timeline

- 2026-10-28T16:33:49+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-93522

## From the sources

A heap buffer overflow caused by mismatched size usage in CopyArea CPU-to-FBO path in X.Org X Server before 21.1.15 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in the X server context.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_