CentOS Errata and Security Advisory 2007:0992
https://rhn.redhat.com/errata/RHSA-2007-0992.html
The following updated files have been uploaded and are currently syncing to the mirrors:
i386: libpng10-1.0.16-3.el4_5.1.i386.rpm libpng10-devel-1.0.16-3.el4_5.1.i386.rpm libpng-1.2.7-3.el4_5.1.i386.rpm libpng-devel-1.2.7-3.el4_5.1.i386.rpm
src: libpng10-1.0.16-3.el4_5.1.src.rpm libpng-1.2.7-3.el4_5.1.src.rpm