The DumpModeDecode function in libtiff 4.0.6 and earlier allows attackers to cause a denial of service (invalid read and crash) via a crafted tiff image.
https://security.gentoo.org/glsa/201701-16
http://www.securityfocus.com/bid/91209
http://www.debian.org/security/2017/dsa-3762
http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00017.html