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    CVE-2026-111123

    FluidSynth through 2.6.1 contains an out-of-bounds write vulnerability that allows attackers to corrupt heap and stack memory by supplying unvalidated SoundFont modulator destination values. Attackers can craft an SF2 file with PMOD/IMOD destinations of 63 to 255 that, when loaded and played, write past the voice generator array and updated_gen_bit, causing memory corruption and crashes.

    Published:Oct 15, 2026
    Last Modified:Oct 15, 2026
    EPS:Oct 15, 2026
    EPSS Score:
    CVSS Score:6.1

    Affected Products

    Vendor
    Fluidsynth
    Product
    Fluidsynth

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-61720 (CVSS 6.2) — FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the SF2 …
    CVE-2026-61723 (CVSS 6.8) — FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the nati…
    CVE-2026-61722 (CVSS 6.8) — FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the nati…
    CVE-2026-61714 (CVSS 7.8) — FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.2.4 until 2.5.6, configur…
    CVE-2026-61721 (CVSS 8) — FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the nati…
    CVE-2026-58264 (CVSS 9.8) — FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 1.1.2 until 2.5.6, the Flui…
    CVE-2025-56225 (CVSS 7.5) — fluidsynth-2.4.6 and earlier versions is vulnerable to Null pointer dereference in fluid_synth_monopoly.c, tha…
    CVE-2025-68617 (CVSS 7) — FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From versions 2.5.0 to before 2.…
    CVE-2021-21417 (CVSS 7.2) — fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was d…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High