The export function in libavfilter/vf_signature.c in FFmpeg through 3.4.2 allows remote attackers to cause a denial of service (out-of-array access) or possibly have unspecified other impact via a long filename.
https://security.gentoo.org/glsa/202003-65
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=35eeff30caf34df835206f1c12bcf4b7c2bd6758