CVE-2026-111123CWE-787

CVE-2026-111123

Medium · published October 15, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
9.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
CVSS v4.0
6.9 · 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
EPSS
0.00198 · 9.1th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-10-15T23:17Z
References (7)
https://github.com/FluidSynth/fluidsynth · [email protected]https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/sfloader/fluid_defsfont.c#L1609-L1611 · [email protected]https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c#L1184-L1229 · [email protected]https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c#L615-L623 · [email protected]https://hackmd.io/@haind-pwn/fluidsynth-sf2-modulator-dest-generator-oob-write · [email protected]https://www.vulncheck.com/advisories/fluidsynth-through-2.6.1-out-of-bounds-write-via-soundfont-modulator-destination · [email protected]https://hackmd.io/@haind-pwn/fluidsynth-sf2-modulator-dest-generator-oob-write · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 15 OCT 18:57Z
    FluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator Destination
    cvelistv5
  • 15 OCT 18:57Z
    FluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator Destination
    cvelistv5