in reply to
Re^2: submitting a patch for a directory
in thread submitting a patch for a directory
No, it is up to the individual module owner to decide which, if any, version control system he or she will use. (The gitpan link submitted by daxim is not "official" and should be viewed as something to fork from to start your repository, if you decide to use github).
I submitted a patch last year to a CPAN member whose code resides on sourceforge, and I'm sure there are coders out there who don't use version control systems at all beyond what CPAN/BackPAN provide.