In LibTIFF 4.0.7, the TIFFReadDirEntryLong8Array function in libtiff/tif_dirread.c mishandles a malloc operation, which allows attackers to cause a denial of service (memory leak within the function _TIFFmalloc in tif_unix.c) via a crafted file.
https://usn.ubuntu.com/3602-1/
http://www.securityfocus.com/bid/99235
http://somevulnsofadlab.blogspot.jp/2017/06/libtiffmemory-leak-in-tiffmalloc.html