Medium severity6.1NVD Advisory· Published Oct 15, 2026· Updated Oct 15, 2026
CVE-2026-111123
CVE-2026-111123
Description
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.
Affected products
1- Range: <=2.6.1
Patches
Vulnerability mechanics
References
5- github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/sfloader/fluid_defsfont.cnvd
- github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.cnvd
- github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.cnvd
- hackmd.io/@haind-pwn/fluidsynth-sf2-modulator-dest-generator-oob-writenvd
- www.vulncheck.com/advisories/fluidsynth-through-2.6.1-out-of-bounds-write-via-soundfont-modulator-destinationnvd
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