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CVE-2026-61722

CVE-2026-61722 · FluidSynth: DLS Articulation Chunk Integer Overflow

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 2.5.0 until 2.5.6, the native DLS parser validates articulation chunks using the unsigned expression cbsize + connblocks * 12 without first ensuring that the multiplication and addition fit in 32 bits. A crafted DLS file can supply a large connblocks value that wraps the expression and bypasses the chunk-size check, after which the parser performs approximately one billion 12-byte iterations beyond the chunk boundary. The excessive processing and invalid reads can cause denial of service. Builds with the CMake option enable-native-dls set to OFF do not expose the parser. This issue is fixed in version 2.5.6.

CVSS 6.8 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • fluidsynth

    Versions
    • >= 2.5.0, < 2.5.6: Affected

    No fix published

  • 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
    • 1.1.6-2ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • fluidsynth Ubuntu:Pro:16.04:LTS

    Versions
    • 1.1.6-2build1
    • 1.1.6-3
    • 1.1.6-3ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • 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
    • 1.1.9-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • fluidsynth Ubuntu:Pro:20.04:LTS

    Versions
    • 1.1.11-4
    • 1.1.11-4ubuntu1
    • 2.1.0-1
    • 2.1.1-2
    • 2.1.1-2ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • fluidsynth Ubuntu:Pro:22.04:LTS

    Versions
    • 2.1.7-1.1
    • 2.2.4-2
    • 2.2.5-1
    • 2.2.5-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • 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
    • 2.3.4-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • fluidsynth Ubuntu:Pro:26.04:LTS

    Versions
    • 2.4.7+dfsg-2
    • 2.4.8+dfsg-1
    • 2.4.8+dfsg-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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