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.
http://www.ubuntu.com/usn/USN-2944-1
http://lists.opensuse.org/opensuse-updates/2016-06/msg00105.html