---
id: CVE-2026-56002
title: "A heap bufferflow in pcfReadFont() due to missing glyph bounds checking\_in libXfont2 before 2.0.8\_ allows attackers authenticated as X client to execute code within the X server."
summary: "A heap bufferflow in pcfReadFont() due to missing glyph bounds checking\_in libXfont2 before 2.0.8\_ allows attackers authenticated as X client to execute code within the X server."
severity: high
cvss: 8.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-122
vendor: x
product: libxfont
affected:
  - libxfont < 2.0.8
patched:
  - libxfont 2.0.8
published: '2026-07-08'
updated: '2026-07-13'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56002'
references:
  - url: >-
      https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bb27b1439968811a3674
    label: meissner@suse.de
  - url: 'https://www.openwall.com/lists/oss-security/2026/07/08/1'
    label: meissner@suse.de
tags:
  - nvd
epss: 0.00562
epssPercentile: 0.44321
ingestedAt: '2026-07-13T14:27:26.818Z'
---

## Overview

A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8  allows attackers authenticated as X client to execute code within the X server.

## Affected

- `libxfont < 2.0.8`

## Remediation

Upgrade past the affected range:

- `libxfont 2.0.8`