Heap-based buffer overflow in libavformat/http.c in FFmpeg before 2.8.10, 3.0.x before 3.0.5, 3.1.x before 3.1.6, and 3.2.x before 3.2.2 allows remote web servers to execute arbitrary code via a negative chunk size in an HTTP response.
https://trac.ffmpeg.org/ticket/5992
https://lists.debian.org/debian-lts-announce/2018/12/msg00009.html
https://github.com/FFmpeg/FFmpeg/commit/2a05c8f813de6f2278827734bf8102291e7484aa
https://ffmpeg.org/security.html
http://www.securityfocus.com/bid/95986