A gnome-screensaver update has been released for CentOS 5

CentOS Errata and Bugfix Advisory 2012:0002

Upstream details at : https://rhn.redhat.com/errata/RHBA-2012-0002.html

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

i386:
3e54b38e91dd4095ec5552733306535d993a51b4678c2a1db5dbbec91b13256f gnome-screensaver-2.16.1-8.el5_7.4.i386.rpm

x86_64:
83d89da2e6cb1e777858a981d9dc72244b068d86adb427832325242c063b88ee gnome-screensaver-2.16.1-8.el5_7.4.x86_64.rpm

Source:
d3efc85e6d01e35f04509fd7986e2433a391020e01f35805cac13b0243287b00 gnome-screensaver-2.16.1-8.el5_7.4.src.rpm