The ff_hevc_decode_nal_sps function in libavcodec/hevc_ps.c in FFMpeg before 2.1.6, 2.2.x through 2.3.x, and 2.4.x before 2.4.4 allows remote attackers to cause a denial of service (out-of-bounds access) via a crafted .bit file.
http://git.videolan.org/?p=ffmpeg.git;a=commit;h=ea38e5a6b75706477898eb1e6582d667dbb9946c