The ff_h264_decode_sei function in libavcodec/h264_sei.c in FFmpeg before 0.10 allows remote attackers to have an unspecified impact via crafted Supplemental enhancement information (SEI) data, which triggers an infinite loop.
http://www.ffmpeg.org/security.html
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=9decfc17bb76da34734296048d390b176abf404c