CVE-2026-111123
FluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator Destination
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | fluidsynth |
| Product | fluidsynth |
| Published | Oct 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Affected Versions
FluidSynth / fluidsynth
0 ≤ 2.6.1
References
hackmd.io: https://hackmd.io/@haind-pwn/fluidsynth-sf2-modulator-dest-generator-oob-write github.com: https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c#L615-L623 github.com: https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c#L1184-L1229 github.com: https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/sfloader/fluid_defsfont.c#L1609-L1611 github.com: https://github.com/FluidSynth/fluidsynth vulncheck.com: https://www.vulncheck.com/advisories/fluidsynth-through-2.6.1-out-of-bounds-write-via-soundfont-modulator-destination
Credits
HaiND from the Post and Telecommunication Institute of Technology