Heap-based Buffer Overflow

Overview Affected versions of this package are vulnerable to Heap-based Buffer Overflow through the VobSub subtitle demuxer in libavformat/mpeg.c’s vobsubreadheader and ffsubtitlesqueueinsert. An attacker can corrupt adjacent heap memory by supplying a malicious .sub/.idx subtitle file that...

CVE-2026-64830

FFmpeg up to 8.1.2 contains a heap buffer overflow in the VobSub subtitle demuxer. A malicious .sub/.idx file with more distinct stream IDs than the fixed-size array bounds in libavformat/mpeg.c can cause unbounded writes beyond the vobsub->q[] boundary via ff_subtitles_queue_insert(), potenti...