The TIFFFdOpen function in tif_unix.c in LibTIFF 4.0.10 has a memory leak, as demonstrated by pal2rgb.
https://usn.ubuntu.com/3906-2/
https://usn.ubuntu.com/3906-1/
https://security.gentoo.org/glsa/202003-25
https://seclists.org/bugtraq/2019/Nov/5
https://lists.debian.org/debian-lts-announce/2019/11/msg00027.html
https://gitlab.com/libtiff/libtiff/commit/0c74a9f49b8d7a36b17b54a7428b3526d20f88a8
http://packetstormsecurity.com/files/155095/Slackware-Security-Advisory-libtiff-Updates.html
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00041.html