The decode_frame function in libavcodec/eamad.c in FFmpeg before 1.1 allows remote attackers to have an unspecified impact via crafted Electronic Arts Madcow video data, which triggers an out-of-bounds array access.
http://www.ffmpeg.org/security.html
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=63ac64864c6e0e84355aa3caa5b92208997a9a8d