The ff_hevc_parse_sps function in libavcodec/hevc_ps.c in FFmpeg before 2.8.2 does not validate the Chroma Format Indicator, which allows remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via crafted High Efficiency Video Coding (HEVC) data.
https://lists.debian.org/debian-lts-announce/2018/12/msg00009.html
http://lists.opensuse.org/opensuse-updates/2015-11/msg00146.html
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=93f30f825c08477fe8f76be00539e96014cc83c8