CentOS Errata and Security Advisory 2007:0157
https://rhn.redhat.com/errata/RHSA-2007-0157.html
The following updated files have been uploaded and are currently syncing to the mirrors:
i386: libX11-1.0.3-8.0.1.el5.i386.rpm libX11-devel-1.0.3-8.0.1.el5.i386.rpm xorg-x11-apps-7.1-4.0.1.el5.i386.rpm
src: libX11-1.0.3-8.0.1.el5.src.rpm xorg-x11-apps-7.1-4.0.1.el5.src.rpm