There is a reachable assertion abort in the function TIFFWriteDirectorySec() in LibTIFF 4.0.8, related to tif_dirwrite.c and a SubIFD tag. A crafted input will lead to a remote denial of service attack.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2017-13726.json"