CVE-2026-121941

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{"bugzilla": {"description": "libmt32emu: libmt32emu: arbitrary code execution via oversized SysEx messages", "id": "2566869", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2566869"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "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.", "A flaw was found in libmt32emu. This vulnerability can allow an attacker to execute arbitrary code or cause a Denial of Service (DoS) by crashing the application. By tricking a user or application into processing crafted Musical Instrument Digital Interface (MIDI) streams containing oversized, unterminated System Exclusive (SysEx) messages, an attacker can trigger a heap buffer overflow that corrupts memory."], "name": "CVE-2026-121941", "public_date": "2026-11-04T12:31:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-121941\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-121941\nhttps://github.com/munt/munt/blob/libmt32emu_2_8_3/mt32emu/src/MidiStreamParser.cpp#L223-L257\nhttps://github.com/munt/munt/commit/1749f7fed5cdb3a9015acce076a1512b1615dc3b\nhttps://github.com/munt/munt/issues/149\nhttps://hackmd.io/@haindpwn/munt-midistreamparser-oversized-sysex-heap-overflow\nhttps://www.vulncheck.com/advisories/libmt32emu-before-2.8.4-heap-buffer-overflow-via-midistreamparserimpl-parsesysex"], "threat_severity": "Important"}

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