{"id":"CVE-2026-111123","title":"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","summary":"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…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","cwe":["CWE-787"],"vendor":"FluidSynth","product":"fluidsynth","affected":["fluidsynth <= 2.6.1"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T19:17:25.580","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-111123","references":[{"url":"https://github.com/FluidSynth/fluidsynth","label":"disclosure@vulncheck.com"},{"url":"https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/sfloader/fluid_defsfont.c#L1609-L1611","label":"disclosure@vulncheck.com"},{"url":"https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c#L1184-L1229","label":"disclosure@vulncheck.com"},{"url":"https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c#L615-L623","label":"disclosure@vulncheck.com"},{"url":"https://hackmd.io/@haind-pwn/fluidsynth-sf2-modulator-dest-generator-oob-write","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/fluidsynth-through-2.6.1-out-of-bounds-write-via-soundfont-modulator-destination","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org","exploit-available"],"ingestedAt":"2026-10-15T19:25:46.406Z","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-15T19:46:04.553463Z"},"slug":"CVE-2026-111123","body":"## Overview\n\nFluidSynth 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":222723,"id":"CVE-2026-111123","ts":1792097063721,"field":"exploit_available","old":"false","new":"true"}]}