CentOS Errata and Security Advisory 2006:0663
https://rhn.redhat.com/errata/RHSA-2006-0663.html
The following updated files have been uploaded and are currently syncing to the mirrors:
i386: ncompress-4.2.4-43.rhel4.i386.rpm
src: ncompress-4.2.4-43.rhel4.src.rpm