{"id":"CVE-2026-121941","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-121941","summary":"libmt32emu before 2.8.4 Heap Buffer Overflow via MidiStreamParserImpl::parseSysex","details":"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.","published":"2026-11-04T12:31:19.851Z","modified":"2026-11-06T01:05:01.077395783Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/munt/munt/commit/1749f7fed5cdb3a9015acce076a1512b1615dc3b","label":"munt/munt@1749f7f"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121941.json"},{"type":"ADVISORY","url":"https://hackmd.io/@haindpwn/munt-midistreamparser-oversized-sysex-heap-overflow"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121941"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/libmt32emu-before-2.8.4-heap-buffer-overflow-via-midistreamparserimpl-parsesysex"},{"type":"REPORT","url":"https://github.com/munt/munt/issues/149"},{"type":"FIX","url":"https://github.com/munt/munt/commit/1749f7fed5cdb3a9015acce076a1512b1615dc3b"},{"type":"PACKAGE","url":"https://github.com/munt/munt"},{"type":"ARTICLE","url":"https://github.com/munt/munt/blob/libmt32emu_2_8_3/mt32emu/src/MidiStreamParser.cpp#L223-L257"},{"type":"EVIDENCE","url":"https://hackmd.io/@haindpwn/cve-2026-121941-munt-midistreamparser-oversized-sysex-heap-overflow"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-11-06T01:05:01.077395783Z"}}