The mov_text_decode_frame function in libavcodec/movtextdec.c in FFmpeg before 1.0.2 allows remote attackers to cause a denial of service (out-of-bounds read and crash) via crafted 3GPP TS 26.245 data.
http://www.ffmpeg.org/security.html
http://secunia.com/advisories/51964
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=68e48ed72e0597ae61bc3e9e6e6d9edcb1a00073