Heap-based buffer overflow in the cpSeparateBufToContigBuf function in tiffcp.c in LibTIFF 3.9.3, 3.9.4, 3.9.5, 3.9.6, 3.9.7, 4.0.0beta7, 4.0.0alpha4, 4.0.0alpha5, 4.0.0alpha6, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.0.4beta, 4.0.5, 4.0.6, 4.0.7, 4.0.8 and 4.0.9 allows remote attackers to cause a denial of service (crash) or possibly have unspecified other impact via a crafted TIFF file.
https://www.debian.org/security/2020/dsa-4670
https://usn.ubuntu.com/3906-2/
https://usn.ubuntu.com/3906-1/
https://lists.debian.org/debian-lts-announce/2019/11/msg00027.html
https://github.com/Hack-Me/Pocs_for_Multi_Versions/tree/main/CVE-2018-12900
https://access.redhat.com/errata/RHSA-2019:3419