CentOS Errata and Security Advisory 2009:0333
https://rhn.redhat.com/errata/RHSA-2009-0333.html
The following updated files have been uploaded and are currently syncing to the mirrors:
s390: updates/s390/RPMS/libpng-1.2.7-3.c4.2.s390.rpm updates/s390/RPMS/libpng-devel-1.2.7-3.c4.2.s390.rpm updates/s390/RPMS/libpng10-1.0.16-3.c4.3.s390.rpm updates/s390/RPMS/libpng10-devel-1.0.16-3.c4.3.s390.rpm
s390x: updates/s390x/RPMS/libpng-1.2.7-3.c4.2.s390x.rpm updates/s390x/RPMS/libpng-devel-1.2.7-3.c4.2.s390x.rpm updates/s390x/RPMS/libpng10-1.0.16-3.c4.3.s390x.rpm updates/s390x/RPMS/libpng10-devel-1.0.16-3.c4.3.s390x.rpm