---
id: CVE-2026-94285
title: >-
  An out-of-bounds read in libX11's byte-oriented codeset parser in libX11
  before 1.8.14 could be used by malicious X servers to crash attached X
  clients.
summary: >-
  An out-of-bounds read in libX11's byte-oriented codeset parser in libX11
  before 1.8.14 could be used by malicious X servers to crash attached X
  clients.
severity: medium
cvss: 5.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'
cwe:
  - CWE-125
vendor: x.org
product: libX11
affected:
  - libX11 < 1.8.14
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T09:17:08.353'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94285'
references:
  - url: >-
      https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/310/diffs?commit_id=980868483446f24f9658d26aa5bfa42f3da6dd3a
    label: meissner@suse.de
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-28T09:06:28.559Z'
---

## Overview

An out-of-bounds read in libX11's byte-oriented codeset parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.