/usr/lib/cgi-bin/man/mansec is in man2html 1.6g-7.
This file is owned by root:root, with mode 0o755.
It is a symlink to /usr/lib/cgi-bin/man/./usr/lib/cgi-bin/man/manwhatis
/usr/lib/cgi-bin/man/./usr/lib/cgi-bin/man/manwhatis