Vulnerability DatabaseCVE-2026-121941
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CVE-2026-121941
Published:November 04, 2026
Updated:November 05, 2026
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 Packages
https://github.com/munt/munt.git (GITHUB):
Affected version(s) =libmt32emu_1_5_0 <libmt32emu_2_8_4 || >=libmt32emu_2_0_0 <libmt32emu_2_8_4
Fix Suggestion:
Update to version libmt32emu_2_8_4
Related Resources (6)
https://github.com/munt/munt/issues/149
https://hackmd.io/@haindpwn/munt-midistreamparser-oversized-sysex-heap-overflow
https://github.com/munt/munt/blob/libmt32emu_2_8_3/mt32emu/src/MidiStreamParser.cpp#L223-L257
https://github.com/munt/munt/commit/1749f7fed5cdb3a9015acce076a1512b1615dc3b
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
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CVSS v4
Base Score:
8.5
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.8
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Heap-based Buffer Overflow
CWE-122