In libopenmpt before 0.3.19 and 0.4.x before 0.4.9, ModPlugInstrumentName and ModPlugSampleName in libopenmptmodplug.c do not restrict the lengths of libmodplug output-buffer strings in the C API, leading to a buffer overflow.

soundlib/pattern.h in libopenmpt before 0.3.9 allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted AMS file because of an invalid write near address 0 in an out-of-memory situation.

soundlib/Loadstp.cpp in OpenMPT through 1.27.04.00, and libopenmpt before 0.3.6, has an out-of-bounds read via a malformed STP file.

soundlib/Loadpsm.cpp in OpenMPT through 1.26.12.00 and libopenmpt before 0.2.8461-beta26 has a heap buffer overflow with the potential for arbitrary code execution via a crafted PSM File that triggers use of the same sample slot for two samples.

libopenmpt before 0.4.3 allows a crash due to a NULL pointer dereference when doing a portamento from an OPL instrument to an empty instrument note map slot.

libopenmpt before 0.4.5 allows a crash during playback due to an out-of-bounds read in XM and MT2 files.

J2B in libopenmpt before 0.4.2 allows an assertion failure during file parsing with debug STLs.

DSM in libopenmpt before 0.4.2 allows an assertion failure during file parsing with debug STLs.

libopenmpt before 0.3.13 allows a crash with malformed MED files.

libopenmpt before 0.3.11 allows a crash with certain malformed custom tunings in MPTM files.

soundlib/Sndfx.cpp in OpenMPT before 1.27.07.00 and libopenmpt before 0.3.8 allows remote attackers to cause a denial of service (out-of-bounds read) via an IT or MO3 file with many nested pattern loops.

libmodplug through 0.8.9.1 contains an out-of-bounds read in patsmplooped in src/loadpat.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 patloops, so an index of zero reads patloops[-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 ModPlugLoad entry point drives the path through CSoundFile::Create, CSoundFile::ReadMID, and MIDReadPatterns 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.