The cdg_decode_frame function in cdgraphics.c in libavcodec in FFmpeg before 1.2.1 does not validate the presence of non-header data in a buffer, which allows remote attackers to cause a denial of service (out-of-bounds array access and application crash) via crafted CD Graphics Video data.
http://www.mandriva.com/security/advisories?name=MDVSA-2014:227
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=ad002e1a13a8df934bd6cb2c84175a4780ab8942
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=7ef2dbd2392e3e4d430e0173e1e5c4df9f18b6dd