The wavpack_decode_frame function in libavcodec/wavpack.c in FFmpeg before 1.1 allows remote attackers to have an unspecified impact via crafted WavPack data, which triggers an out-of-bounds array access, possibly due to an off-by-one error.
http://www.ffmpeg.org/security.html
http://www.debian.org/security/2013/dsa-2793
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=be818df547c3b0ae4fadb50fd210139a8636706a