CVE-2021-21417highCWE-416

CVE-2021-21417: high-severity vulnerability in fluidsynth

Use after free in fluidsynth

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.2epss 0.9%
fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Affected products
FluidSynth · fluidsynth
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In the same product, most dangerous first.

CVE-2026-58264CRITICALFluidSynth: Heap-based buffer overrunEPSS 0.6%CVE-2025-68617HIGHUse after free in fluidsynthEPSS 0.2%CVE-2026-61722MEDIUMFluidSynth: DLS Articulation Chunk Integer OverflowEPSS 0.2%CVE-2026-111123MEDIUMFluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator DestinationEPSS 0.2%CVE-2026-61721HIGHFluidSynth: Heap-based buffer overrun for DLS samplesEPSS 0.2%CVE-2026-61720MEDIUMFluidSynth: SF2 DMOD Chunk Unsigned UnderflowEPSS 0.2%