There is a SEGV in Exiv2::Internal::TiffParserWorker::findPrimaryGroups of tiffimage_int.cpp in Exiv2 0.27-RC3. A crafted input will lead to a remote denial of service attack.
https://lists.debian.org/debian-lts-announce/2023/01/msg00004.html
https://lists.debian.org/debian-lts-announce/2019/02/msg00038.html
https://github.com/TeamSeri0us/pocs/tree/master/exiv2/20181206