---
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: '2026-09-30'
sourceUpdated: '2026-09-30T13:17:26.570'
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
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94285.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-94285'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2542376'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-94285'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94285'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-30T12:52:16.275635Z'
epss: 0.00147
epssPercentile: 0.03878
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.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Hardened Images · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94285.json)