Updated Samba packages are available for CentOS-3
These should be populating out to your mirrors soon.
Samba: https://rhn.redhat.com/errata/RHSA-2004-632.html
RPMS/samba-3.0.7-1.3E.1.i386.rpm
RPMS/samba-client-3.0.7-1.3E.1.i386.rpm
RPMS/samba-common-3.0.7-1.3E.1.i386.rpm
RPMS/samba-swat-3.0.7-1.3E.1.i386.rpm
SRPMS/samba-3.0.7-1.3E.1.src.rpm
You can apply all of these updates with:
yum update
