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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
munt libmt32emu
Default version status: unaffected
0 to < 2.8.4affected
pkg:github/munt/muntReferences
- https://github.com/munt/munt/issues/149 ↗
- https://hackmd.io/@haindpwn/munt-midistreamparser-oversized-sysex-heap-overflow ↗
- https://github.com/munt/munt/commit/1749f7fed5cdb3a9015acce076a1512b1615dc3b ↗
- https://github.com/munt/munt/blob/libmt32emu_2_8_3/mt32emu/src/MidiStreamParser.cpp#L223-L257 ↗
- https://www.vulncheck.com/advisories/libmt32emu-before-2.8.4-heap-buffer-overflow-via-midistreamparserimpl-parsesysex ↗
- https://hackmd.io/@haindpwn/cve-2026-121941-munt-midistreamparser-oversized-sysex-heap-overflow ↗