High severity7.8NVD Advisory· Published Nov 4, 2026
CVE-2026-121941
CVE-2026-121941
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
1Patches
Vulnerability mechanics
References
5- github.com/munt/munt/blob/libmt32emu_2_8_3/mt32emu/src/MidiStreamParser.cppnvd
- github.com/munt/munt/commit/1749f7fed5cdb3a9015acce076a1512b1615dc3bnvd
- github.com/munt/munt/issues/149nvd
- hackmd.io/@haindpwn/munt-midistreamparser-oversized-sysex-heap-overflownvd
- www.vulncheck.com/advisories/libmt32emu-before-2.8.4-heap-buffer-overflow-via-midistreamparserimpl-parsesysexnvd
News mentions
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