CVE-2026-121941

High

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.

SeverityHigh

CVSS7.8

Exploit probability—

ProductLibmt32emu

PublishedNov 4, 2026

First seenNov 4, 2026

Weakness typeCWE-122CWE-122

How to fix

Update

libmt32emu2.8.4 or later

Patches

github.com/munt/munt/commit/1749f7fed5cdb3a9015acce076a1512b1615dc3b

Affected products

Product	Affected versions	Fixed in
libmt32emu	No range specified	2.8.4

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