fluidsynth: FluidSynth is a software synthesizer based on the SoundFont 2 specifications
CVE-2026-61720 is fixed in fluidsynth on 1 platform by DEBIAN-CVE-2026-61720 (version 2.5.6+dfsg-1), released July 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| fluidsynth · Debian 14 | 2.5.6+dfsg-1 | DEBIAN-CVE-2026-61720 | Jul 26, 2026 |
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