The dnxhd_decode_header function in libavcodec/dnxhddec.c in FFmpeg 3.0 through 3.3.2 allows remote attackers to cause a denial of service (out-of-array access) or possibly have unspecified other impact via a crafted DNxHD file.
https://github.com/FFmpeg/FFmpeg/commit/f31fc4755f69ab26bf6e8be47875b7dcede8e29e
https://github.com/FFmpeg/FFmpeg/commit/296debd213bd6dce7647cedd34eb64e5b94cdc92