{"id":"CVE-2026-111123","state":"PUBLISHED","title":"FluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator Destination","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.","publishedAt":"2026-10-15T18:57:20.663Z","updatedAt":"2026-10-15T19:46:31.057Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["FluidSynth fluidsynth"],"affected":[{"vendor":"FluidSynth","product":"fluidsynth","packageURL":"pkg:github/FluidSynth/fluidsynth","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"2.6.1","versionType":"semver"}],"collectionURL":"https://github.com","repo":"https://github.com/FluidSynth/fluidsynth"}],"references":["https://hackmd.io/@haind-pwn/fluidsynth-sf2-modulator-dest-generator-oob-write","https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c#L615-L623","https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c#L1184-L1229","https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/sfloader/fluid_defsfont.c#L1609-L1611","https://github.com/FluidSynth/fluidsynth","https://www.vulncheck.com/advisories/fluidsynth-through-2.6.1-out-of-bounds-write-via-soundfont-modulator-destination"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/111xxx/CVE-2026-111123.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-111123","state":"PUBLISHED","datePublished":"2026-10-15T18:57:20.663Z","dateUpdated":"2026-10-15T19:46:31.057Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-15T17:03:42.957Z"},"containers":{"cna":{"title":"FluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator Destination","descriptions":[{"lang":"en","value":"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. 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