CVE-2026-75904
LowCVSS 3.3Summary
libmodplug through 0.8.9.1 contains an out-of-bounds read in pat_smplooped in src/load_pat.cpp. The function validates only the upper bound of its sample index and then subtracts one before indexing the pat_loops array, allowing a read of one byte before the array when the index is zero.
Risk Assessment
Out-of-bounds read may lead to unexpected MIDI playback behavior, and in extreme cases, data disclosure or application crash.
Recommendation
Update libmodplug to a patched version or avoid processing untrusted MIDI files.
Original NVD description (English source)
libmodplug through 0.8.9.1 contains an out-of-bounds read in pat_smplooped in src/load_pat.cpp. The function validates only the upper bound of its sample index against MAXSMP and then subtracts one before indexing the 191-byte static array pat_loops, so an index of zero reads pat_loops[-1], one byte before the array. The index is the smpno field of a parsed MIDI event, which is initialised to zero and only later overwritten from a program-change parameter, so an event reaching the note test before an instrument is assigned carries zero. A 32-byte MIDI file supplied to the library's public ModPlug_Load entry point drives the path through CSoundFile::Create, CSoundFile::ReadMID, and MID_ReadPatterns to the read. The byte read out of bounds determines whether a note event is treated as looping, so adjacent static storage influences playback state.