perl-core package has a description "A metapackage which requires all of the perl bits and modules in the upstream tarball from perl.org."
However it's not accurate. It misses CGI.pm
CGI.pm is not listed in dependencies http://pkgs.org/centos-6-rhel-6/centos-rhel-x86_64/perl-core-5.10.1-129.el6.x86_64.rpm.html
And CGI.pm does not get installed after perl-core install
I propose update description for perl-core package and mention that not everything from tarball is installed.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.