The filter_slice function in libavfilter/vf_transpose.c in FFmpeg through 3.4.1 allows remote attackers to cause a denial of service (out-of-array access) via a crafted MP4 file.
https://www.debian.org/security/2018/dsa-4249
https://lists.debian.org/debian-lts-announce/2019/03/msg00041.html
https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/c6939f65a116b1ffed345d29d8621ee4ffb32235
https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/3f621455d62e46745453568d915badd5b1e5bcd5