p PatchFirst

CVE-2026-56003

CVE-2026-56003 · libXfont2 computeProps Property Buffer Heap Buffer Overflow

This page contains facts from public vulnerability sources. Check the original advisory before updating.

A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.

CVSS 8.5 · High · EPSS 0.4% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • libxfont2

    Versions
    • ≥ 0, < 2.0.8: Affected (rpm)

    Update to 2.0.8

  • libxfont Debian:12

    Versions
    • 1:2.0.6-1
    Affected ranges
    • ECOSYSTEM: < 1:2.0.6-1+deb12u1

    Update to 1:2.0.6-1+deb12u1

  • libxfont Debian:13

    Versions
    • 1:2.0.6-1
    Affected ranges
    • ECOSYSTEM: < 1:2.0.6-1+deb13u1

    Update to 1:2.0.6-1+deb13u1

  • libxfont Debian:14

    Versions
    • 1:2.0.6-1
    • 1:2.0.6-1+hurd.1
    • 1:2.0.6-2
    Affected ranges
    • ECOSYSTEM: < 1:2.0.8-1

    Update to 1:2.0.8-1

  • libxfont Ubuntu:Pro:14.04:LTS

    Versions
    • 1:1.4.6-1
    • 1:1.4.6-1ubuntu1
    • 1:1.4.7-1
    • 1:1.4.7-1ubuntu0.1
    • 1:1.4.7-1ubuntu0.2
    • 1:1.4.7-1ubuntu0.3
    • 1:1.4.7-1ubuntu0.4
    Affected ranges
    • ECOSYSTEM: < 1:1.4.7-1ubuntu0.4+esm2

    Update to 1:1.4.7-1ubuntu0.4+esm2

  • libxfont Ubuntu:Pro:16.04:LTS

    Versions
    • 1:1.5.1-1
    • 1:1.5.1-1ubuntu0.16.04.1
    • 1:1.5.1-1ubuntu0.16.04.2
    • 1:1.5.1-1ubuntu0.16.04.3
    • 1:1.5.1-1ubuntu0.16.04.4
    Affected ranges
    • ECOSYSTEM: < 1:1.5.1-1ubuntu0.16.04.4+esm2

    Update to 1:1.5.1-1ubuntu0.16.04.4+esm2

  • libxfont2 Ubuntu:16.04:LTS

    Versions
    • 1:2.0.1-3~ubuntu16.04.1
    • 1:2.0.1-3~ubuntu16.04.2
    • 1:2.0.1-3~ubuntu16.04.3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxfont Ubuntu:Pro:18.04:LTS

    Versions
    • 1:2.0.1-3ubuntu1
    • 1:2.0.1-4
    • 1:2.0.1-4ubuntu1
    • 1:2.0.3-1
    Affected ranges
    • ECOSYSTEM: < 1:2.0.3-1ubuntu0.1~esm2

    Update to 1:2.0.3-1ubuntu0.1~esm2

  • libxfont Ubuntu:Pro:20.04:LTS

    Versions
    • 1:2.0.3-1
    Affected ranges
    • ECOSYSTEM: < 1:2.0.3-1ubuntu0.20.04.1~esm2

    Update to 1:2.0.3-1ubuntu0.20.04.1~esm2

  • libxfont Ubuntu:22.04:LTS

    Versions
    • 1:2.0.4-1build3
    • 1:2.0.5-1
    • 1:2.0.5-1build1
    Affected ranges
    • ECOSYSTEM: < 1:2.0.5-1ubuntu0.2

    Update to 1:2.0.5-1ubuntu0.2

  • libxfont Ubuntu:24.04:LTS

    Versions
    • 1:2.0.6-1
    • 1:2.0.6-1build1
    Affected ranges
    • ECOSYSTEM: < 1:2.0.6-1+deb13u1build0.24.04.2

    Update to 1:2.0.6-1+deb13u1build0.24.04.2

  • libxfont Ubuntu:25.10

    Versions
    • 1:2.0.6-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxfont Ubuntu:26.04:LTS

    Versions
    • 1:2.0.6-1build1
    • 1:2.0.6-1build2
    • 1:2.0.6-2
    Affected ranges
    • ECOSYSTEM: < 1:2.0.6-2ubuntu0.2

    Update to 1:2.0.6-2ubuntu0.2

Original sources

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