{"id":"AZL-96854","summary":"CVE-2026-75904 affecting package libmodplug 0.8.9.0-12","details":"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.","modified":"2026-09-03T05:28:38Z","published":"2026-08-18T16:18:22Z","upstream":["CVE-2026-75904"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75904"}],"affected":[{"package":{"name":"libmodplug","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/libmodplug"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.8.9.0-12"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-96854.json"}}],"schema_version":"1.9.0"}