CVE-2026-111123: medium-severity vulnerability in fluidsynth
FluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator Destination
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.9epss 0.2%
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.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Affected products
FluidSynth · fluidsynthRelated CVEs — fluidsynth
In the same product, most dangerous first.
CVE-2021-21417HIGHUse after free in fluidsynthEPSS 0.9%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-2026-61721HIGHFluidSynth: Heap-based buffer overrun for DLS samplesEPSS 0.2%CVE-2026-61720MEDIUMFluidSynth: SF2 DMOD Chunk Unsigned UnderflowEPSS 0.2%
References
https://github.com/FluidSynth/fluidsynthhttps://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/sfloader/fluid_defsfont.c#L1609-L1611https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c#L1184-L1229https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c#L615-L623https://hackmd.io/@haind-pwn/fluidsynth-sf2-modulator-dest-generator-oob-writehttps://www.vulncheck.com/advisories/fluidsynth-through-2.6.1-out-of-bounds-write-via-soundfont-modulator-destination