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Latest version in Bugzilla is 4.0.1, but http://download.osgeo.org/libtiff/ lists 4.0.9. Also http://www.libtiff.org/ says latest is 3.6.1 version. HTTPS is still missing from http://bugzilla.maptools.org/
now 4.0.10 is out, and it is still missing from bugzilla ;)
Bugzilla is no longer used for tracking libtiff issues. Remaining open tickets, such as this one, have been migrated to the libtiff GitLab instance at https://gitlab.com/libtiff/libtiff/issues . The migrated tickets have their summary prefixed with [BZ#XXXX] where XXXX is the initial Bugzilla issue number.