CVE-2026-121941

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    CVE-2026-121941

    Published: 4 Nov 2026Last Modified: 6 Nov 2026

    Summary: libmt32emu before 2.8.4 Heap Buffer Overflow via MidiStreamParserImpl::parseSysex

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121941.json, https://hackmd.io/@haindpwn/munt-midistreamparser-oversized-sysex-heap-overflow, https://nvd.nist.gov/vuln/detail/CVE-2026-121941, https://www.vulncheck.com/advisories/libmt32emu-before-2.8.4-heap-buffer-overflow-via-midistreamparserimpl-parsesysex, https://github.com/munt/munt/issues/149, https://github.com/munt/munt/commit/1749f7fed5cdb3a9015acce076a1512b1615dc3b, https://github.com/munt/munt, https://github.com/munt/munt/blob/libmt32emu_2_8_3/mt32emu/src/MidiStreamParser.cpp#L223-L257, https://hackmd.io/@haindpwn/cve-2026-121941-munt-midistreamparser-oversized-sysex-heap-overflow

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -1749f7fed5cdb3a9015acce076a1512b1615dc3b

    Affected versions

    munt_2_8_2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-121941 | CVE-DB