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CVE-2026-58264

CVE-2026-58264 · FluidSynth: Heap-based buffer overrun

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

FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 1.1.2 until 2.5.6, the FluidSynth command handler accepts a pitch_bend_range command whose channel argument is not bounds checked before the supplied value is written through the selected synth channel. An out-of-range channel can therefore cause an out-of-bounds heap write, leading to denial of service or possible code execution. The issue is remotely reachable when the TCP server is enabled through new_fluid_server() or fluidsynth -s, and it is locally reachable through malicious commands delivered to the FluidSynth shell on standard input. Applications that do not use the shell, command handler, or TCP server are not affected. This issue is fixed in version 2.5.6.

CVSS 9.8 · Critical · EPSS 0.6% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • fluidsynth

    Versions
    • >= 1.1.2, < 2.5.6: Affected

    No fix published

  • fluidsynth Debian:12

    Versions
    • 2.3.1-2
    • 2.3.2-1
    • 2.3.3-1
    • 2.3.3-2
    • 2.3.3-2.1
    • 2.3.4-1
    • 2.3.5-1
    • 2.3.6-1
    • 2.4.0-1
    • 2.4.0-1~hurd.1
    • 2.4.0-1~hurd.2
    • 2.4.2-1
    • 2.4.3+dfsg-1
    • 2.4.3+dfsg-2
    • 2.4.3+dfsg-3
    • 2.4.3+dfsg-4
    • 2.4.3-1
    • 2.4.4+dfsg-1
    • 2.4.6+dfsg-1
    • 2.4.7+dfsg-1
    • 2.4.7+dfsg-2
    • 2.4.8+dfsg-1
    • 2.5.0+dfsg-1
    • 2.5.1+dfsg-1
    • 2.5.1+dfsg-2
    • 2.5.2+dfsg-1
    • 2.5.3+dfsg-1
    • 2.5.4+dfsg-1
    • 2.5.5+dfsg-1
    • 2.5.5+dfsg-2
    • 2.5.6+dfsg-1
    • 2.5.7+dfsg-1
    • 2.6.0+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • fluidsynth Debian:13

    Versions
    • 2.4.4+dfsg-1
    • 2.4.4+dfsg-1+deb13u1
    • 2.4.4+dfsg-1+deb13u2
    Affected ranges
    • ECOSYSTEM: < 2.4.4+dfsg-1+deb13u3

    Update to 2.4.4+dfsg-1+deb13u3

  • fluidsynth Debian:14

    Versions
    • 2.4.4+dfsg-1
    • 2.4.6+dfsg-1
    • 2.4.7+dfsg-1
    • 2.4.7+dfsg-2
    • 2.4.8+dfsg-1
    • 2.5.0+dfsg-1
    • 2.5.1+dfsg-1
    • 2.5.1+dfsg-2
    • 2.5.2+dfsg-1
    • 2.5.3+dfsg-1
    • 2.5.4+dfsg-1
    • 2.5.5+dfsg-1
    • 2.5.5+dfsg-2
    Affected ranges
    • ECOSYSTEM: < 2.5.6+dfsg-1

    Update to 2.5.6+dfsg-1

  • fluidsynth Ubuntu:Pro:14.04:LTS

    Versions
    • 1.1.6-2
    Affected ranges
    • ECOSYSTEM: < 1.1.6-2ubuntu0.1~esm1

    Update to 1.1.6-2ubuntu0.1~esm1

  • fluidsynth Ubuntu:Pro:16.04:LTS

    Versions
    • 1.1.6-2build1
    • 1.1.6-3
    Affected ranges
    • ECOSYSTEM: < 1.1.6-3ubuntu0.1~esm1

    Update to 1.1.6-3ubuntu0.1~esm1

  • fluidsynth Ubuntu:Pro:18.04:LTS

    Versions
    • 1.1.6-4
    • 1.1.8-1
    • 1.1.8-2
    • 1.1.8-3
    • 1.1.9-1
    Affected ranges
    • ECOSYSTEM: < 1.1.9-1ubuntu0.1~esm1

    Update to 1.1.9-1ubuntu0.1~esm1

  • fluidsynth Ubuntu:Pro:20.04:LTS

    Versions
    • 1.1.11-4
    • 1.1.11-4ubuntu1
    • 2.1.0-1
    • 2.1.1-2
    Affected ranges
    • ECOSYSTEM: < 2.1.1-2ubuntu0.1~esm1

    Update to 2.1.1-2ubuntu0.1~esm1

  • fluidsynth Ubuntu:Pro:22.04:LTS

    Versions
    • 2.1.7-1.1
    • 2.2.4-2
    • 2.2.5-1
    Affected ranges
    • ECOSYSTEM: < 2.2.5-1ubuntu0.1~esm1

    Update to 2.2.5-1ubuntu0.1~esm1

  • fluidsynth Ubuntu:Pro:24.04:LTS

    Versions
    • 2.3.3-2.1
    • 2.3.4-1
    • 2.3.4-1build1
    • 2.3.4-1build2
    • 2.3.4-1build3
    Affected ranges
    • ECOSYSTEM: < 2.3.4-1ubuntu0.1~esm1

    Update to 2.3.4-1ubuntu0.1~esm1

  • fluidsynth Ubuntu:Pro:26.04:LTS

    Versions
    • 2.4.7+dfsg-2
    • 2.4.8+dfsg-1
    Affected ranges
    • ECOSYSTEM: < 2.4.8+dfsg-1ubuntu0.1~esm1

    Update to 2.4.8+dfsg-1ubuntu0.1~esm1

Original sources

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