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CVE-2026-61720

FluidSynth: SF2 DMOD Chunk Unsigned Underflow

CVSS 3.1 6.2 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-61720

Published

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.

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Affected versions, risk and source history

Exploitation and risk

Source status

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Risk history

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Advisory history

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