{"id":"CVE-2026-111123","summary":"FluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator Destination","details":"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.","modified":"2026-10-16T10:46:27.367498297Z","published":"2026-10-15T18:57:20.663Z","database_specific":{"cwe_ids":["CWE-787"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111123.json","cna_assigner":"VulnCheck"},"references":[{"type":"WEB","url":"https://github.com"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111123.json"},{"type":"PACKAGE","url":"https://github.com/FluidSynth/fluidsynth"},{"type":"ARTICLE","url":"https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/sfloader/fluid_defsfont.c#L1609-L1611"},{"type":"ARTICLE","url":"https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c#L1184-L1229"},{"type":"ARTICLE","url":"https://github.com/FluidSynth/fluidsynth/blob/71e85b2ca6bf48641ba7e2261d8f2640ae473773/src/synth/fluid_voice.c#L615-L623"},{"type":"ARTICLE","url":"https://hackmd.io/@haind-pwn/fluidsynth-sf2-modulator-dest-generator-oob-write"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111123"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/fluidsynth-through-2.6.1-out-of-bounds-write-via-soundfont-modulator-destination"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/fluidsynth/fluidsynth","events":[{"introduced":"0"},{"last_affected":"71e85b2ca6bf48641ba7e2261d8f2640ae473773"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"2.6.1"}],"source":"AFFECTED_FIELD"}}],"versions":["v2.6.1","v2.6.0","v2.5.2","v2.5.1","v2.5.0","v2.4.6","v2.4.5","v2.4.4","v2.4.3","v2.4.2","v2.4.1","v2.4.0","v2.3.4","v2.3.3","v2.3.2","v2.3.1","v2.3.0","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.2.0.rc1","v2.2.0.beta1","v2.1.3","v2.1.2","v2.1.1","v2.1.0","v2.1.0.rc1","v2.0.2","v2.0.1","v2.0.0","v2.0.0.rc1","v2.0.0.beta2","v2.0.0.beta1","v1.1.6","v1.1.5","v1.1.4","v1.1.3","v1.1.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111123.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}