CentOS Errata and Security Advisory 2007:0675
https://rhn.redhat.com/errata/RHSA-2007-0675.html
The following updated files have been uploaded and are currently syncing to the mirrors:
s390: updates/s390/RPMS/perl-Net-DNS-0.48-2.el4.s390.rpm
s390x: updates/s390/RPMS/perl-Net-DNS-0.48-2.el4.s390x.rpm