tif_dirread.c in LibTIFF 4.0.7 might allow remote attackers to cause a denial of service (divide-by-zero error and application crash) via a crafted image.
https://usn.ubuntu.com/3602-1/
https://security.gentoo.org/glsa/201709-27
https://blogs.gentoo.org/ago/2017/04/01/libtiff-multiple-ubsan-crashes