Unspecified vulnerability in libavcodec/vp56.c in FFmpeg before 0.11, and Libav 0.7.x before 0.7.7 and 0.8.x before 0.8.5, has unknown impact and attack vectors, related to "freeing the returned frame."
http://www.ubuntu.com/usn/USN-1706-1
http://www.ubuntu.com/usn/USN-1705-1
http://www.securityfocus.com/bid/55355
http://www.openwall.com/lists/oss-security/2012/09/02/4
http://www.openwall.com/lists/oss-security/2012/08/31/3
http://secunia.com/advisories/50468
http://libav.org/releases/libav-0.8.5.changelog
http://libav.org/releases/libav-0.7.7.changelog
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=d85b3c4fff4c4b255232fcc01edbd57f19d60998