block_cmp() in libavcodec/zmbvenc.c in FFmpeg 4.1.3 has a heap-based buffer over-read.Referenceshttps://trac.ffmpeg.org/ticket/7980https://security.gentoo.org/glsa/202003-65https://usn.ubuntu.com/4431-1/https://security.gentoo.org/glsa/202007-58
