The mjpeg_decode_scan_progressive_ac function in libavcodec/mjpegdec.c in FFmpeg before 1.1 allows remote attackers to have an unspecified impact via crafted MJPEG data.
http://www.ffmpeg.org/security.html
http://www.debian.org/security/2013/dsa-2793
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=1f41cffe1e3e79620f587545bdfcbd7e6e68ed29