The mov_read_dref function in libavformat/mov.c in Libav before 11.7 and FFmpeg before 0.11 allows remote attackers to cause a denial of service (memory corruption) or execute arbitrary code via the entries value in a dref box in an MP4 file.
http://www.debian.org/security/2016/dsa-3603
http://lists.opensuse.org/opensuse-updates/2016-06/msg00105.html