SlackBuildsOrg/perl/perl-CGI

Perl module for handling Common Gateway Interface requests and
responses.

See https://metacpan.org/pod/CGI

In particular, please note:

"CGI.pm is no longer considered good practice for developing web
applications, including quick prototyping and small web scripts.
There are far better, cleaner, quicker, easier, safer, more scalable,
more extensible, more modern alternatives available at this point in
time."