Updated glibc packages has been released for CentOS-3 i386

https://rhn.redhat.com/errata/RHSA-2004-586.html refers

Changed files :

updates/i386/RPMS/glibc-2.3.2-95.30.i386.rpm
updates/i386/RPMS/glibc-2.3.2-95.30.i686.rpm
updates/i386/RPMS/glibc-common-2.3.2-95.30.i386.rpm
updates/i386/RPMS/glibc-devel-2.3.2-95.30.i386.rpm
updates/i386/RPMS/glibc-headers-2.3.2-95.30.i386.rpm
updates/i386/RPMS/glibc-profile-2.3.2-95.30.i386.rpm
updates/i386/RPMS/glibc-utils-2.3.2-95.30.i386.rpm
updates/i386/RPMS/nptl-devel-2.3.2-95.30.i686.rpm

updates/i386/SRPMS/glibc-2.3.2-95.30.src.rpm

and in the extras repo

extras/i386/RPMS/glibc-2.3.2-95.30.i586.rpm

To update to latest versions run yum update

These are on mirror.caosity.org now and should be on local mirrors within a few hours.