Buffer overflow in the readgifimage function in gif2tiff.c in the gif2tiff tool in LibTIFF 4.0.6 allows remote attackers to cause a denial of service (segmentation fault) via a crafted gif file.
https://usn.ubuntu.com/3606-1/
https://security.gentoo.org/glsa/201701-16
https://bugzilla.redhat.com/show_bug.cgi?id=1343407