The TIFFWriteDirectoryTagCheckedRational function in tif_dirwrite.c in LibTIFF 4.0.6 allows remote attackers to cause a denial of service (assertion failure and application exit) via a crafted TIFF file.
https://usn.ubuntu.com/3602-1/
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-1553