A gnome-screensaver update has been released for CentOS 5

CentOS Errata and Bugfix Advisory 2012:0008

Upstream details at : https://rhn.redhat.com/errata/RHBA-2012-0008.html

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

i386:
ea48a7e44c4d147177b900cc46338d3ca544f9b333cfcc235dc6544f27deb13a gnome-screensaver-2.16.1-8.el5_7.5.i386.rpm

x86_64:
81830f4a846ed33c5ea9e3b23295b39950ab81a29c0a94f0dedb90b76cb1baa4 gnome-screensaver-2.16.1-8.el5_7.5.x86_64.rpm

Source:
97165f207769fb6222d35179017359e2e7b62a374d2e0fec72268a4063ec950b gnome-screensaver-2.16.1-8.el5_7.5.src.rpm