The ff_h263_decode_mba function in libavcodec/ituh263dec.c in Libav before 11.5 allows remote attackers to cause a denial of service (divide-by-zero error and application crash) via a file with crafted dimensions.
https://libav.org/releases/libav-11.5.changelog
https://git.libav.org/?p=libav.git%3Ba=commitdiff%3Bh=0a49a62f998747cfa564d98d36a459fe70d3299b
https://blogs.gentoo.org/ago/2015/07/16/libav-divide-by-zero-in-ff_h263_decode_mba/
http://www.ubuntu.com/usn/USN-2944-1
http://www.securityfocus.com/bid/75932
http://lists.opensuse.org/opensuse-updates/2016-06/msg00105.html