CentOS Errata and Security Advisory 2008:0492
https://rhn.redhat.com/errata/RHSA-2008-0492.html
The following updated files have been uploaded and are currently syncing to the mirrors:
s390: updates/s390/RPMS/gnutls-1.0.20-4.c4.s390.rpm updates/s390/RPMS/gnutls-devel-1.0.20-4.c4.s390.rpm
s390x: updates/s390x/RPMS/gnutls-1.0.20-4.c4.s390x.rpm updates/s390x/RPMS/gnutls-devel-1.0.20-4.c4.s390x.rpm