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VULNERABILITIES

CVE-2026-121941 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://hackmd.io/@haindpwn/cve-2026-121941-munt-midistreamparser-oversized-sysex-heap-overflow CISA-ADP
https://github.com/munt/munt/blob/libmt32emu_2_8_3/mt32emu/src/MidiStreamParser.cpp#L223-L257 [email protected]
https://github.com/munt/munt/commit/1749f7fed5cdb3a9015acce076a1512b1615dc3b [email protected]
https://github.com/munt/munt/issues/149 [email protected]
https://hackmd.io/@haindpwn/munt-midistreamparser-oversized-sysex-heap-overflow [email protected]

see all 6 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-122Heap-based Buffer Overflow[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-121941
NVD Published Date:
Nov 4, 2026
NVD Last Modified:
Nov 4, 2026
Source:
[email protected]
CVE-2026-121941 Details - Not Deferred