{"affected":[{"defaultStatus":"unaffected","ecosystem":"github","packageName":"munt/munt","product":"libmt32emu","source":"CNA: VulnCheck","vendor":"munt","versions":[{"lessThan":"2.8.4","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-121941","cwes":["CWE-122"],"description":"libmt32emu before 2.8.4 contains a heap buffer overflow vulnerability in MidiStreamParserImpl::parseSysex that allows attackers to write past a heap allocation by supplying oversized unterminated SysEx messages. Attackers can feed more than 32768 SysEx data bytes through the mt32emu_parse_stream API via MIDI files, ports, or sequencer clients to corrupt heap memory and crash the application.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":8.5,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":7.8,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"}],"modifiedAt":1793795479851,"publishedAt":1793795479851,"references":[{"source":"CNA: VulnCheck","tags":["issue-tracking"],"url":"https://github.com/munt/munt/issues/149"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://hackmd.io/@haindpwn/munt-midistreamparser-oversized-sysex-heap-overflow"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/munt/munt/commit/1749f7fed5cdb3a9015acce076a1512b1615dc3b"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/munt/munt/blob/libmt32emu_2_8_3/mt32emu/src/MidiStreamParser.cpp#L223-L257"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/libmt32emu-before-2.8.4-heap-buffer-overflow-via-midistreamparserimpl-parsesysex"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/munt/munt/commit/1749f7fed5cdb3a9015acce076a1512b1615dc3b"}],"revision":"3125fd7ddebcfe48ed58bd4418739ff96e16f7e4288ae7c261546280b221370e","sources":[{"modifiedAt":1793795479851,"name":"CNA: VulnCheck","retrievedAt":1793797810246,"url":"https://www.cve.org/CVERecord?id=CVE-2026-121941"}],"ssvc":null,"status":"published","title":"libmt32emu before 2.8.4 Heap Buffer Overflow via MidiStreamParserImpl::parseSysex","updatedAt":1793797810246}