The read_header function in libavcodec/ffv1dec.c in FFmpeg 2.4 and 3.3.4 and possibly earlier allows remote attackers to have unspecified impact via a crafted MP4 file, which triggers an out-of-bounds read.
git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=c20f4fcb74da2d0432c7b54499bb98f48236b904
www.openwall.com/lists/oss-security/2017/11/03/4
www.securityfocus.com/bid/101690
github.com/FFmpeg/FFmpeg/commit/d893253fcd93d11258e98857175e93be7d158708
lists.debian.org/debian-lts-announce/2019/01/msg00006.html
www.debian.org/security/2017/dsa-4049