Unspecified vulnerability in the avi_read_packet function in libavformat/avidec.c in FFmpeg before 0.11, and Libav 0.7.x before 0.7.7 and 0.8.x before 0.8.4, has unknown impact and attack vectors, related to an "out of array read" when a "packet is shrunk."
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://www.mandriva.com/security/advisories?name=MDVSA-2013:079
http://secunia.com/advisories/51257
http://secunia.com/advisories/50468
http://libav.org/releases/libav-0.8.4.changelog
http://libav.org/releases/libav-0.7.7.changelog
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=c41ac870470c614185e1752c11f892809022248a