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    CVE-2026-61720

    FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the SF2 parser computes the DMOD modulator count as chunk.size / SF_MOD_SIZE - 1 without rejecting chunks smaller than one record. A crafted SF2 file containing a zero-sized DMOD chunk makes the unsigned subtraction wrap to UINT_MAX, and the parser then attempts billions of SFMod allocations. This exhausts process memory and causes denial of service. No workaround is available. This issue is fixed in version 2.5.6.

    Published:Sep 18, 2026
    Last Modified:Sep 21, 2026
    EPS:Sep 18, 2026
    EPSS Score:0.00143
    CVSS Score:6.2

    Affected Products

    Vendor
    Fluidsynth
    Product
    Fluidsynth

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-111123 (CVSS 6.9) — FluidSynth through 2.6.1 contains an out-of-bounds write vulnerability that allows attackers to corrupt heap a…
    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
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    User Interaction
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    Integrity
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