CentOS Errata and Security Advisory CESA-2005:595 SquirrelMail security update for CentOS 3 x86_64: https://rhn.redhat.com/errata/RHSA-2005-595.html The following updated file has been uploaded and is currently syncing to the mirrors: x86_64: updates/x86_64/RPMS/squirrelmail-1.4.3a-11.EL3.centos.1.noarch.rpm source: updates/SRPMS/squirrelmail-1.4.3a-11.EL3.centos.1.src.rpm You may update your CentOS-3 x86_64 installations by running the command: yum update squirrelMail -sv