here are updated packages in the Yum repository:
- PHP 5.3.12 for CentOS 5 changelog
- PHP 5.4.2 for CentOS 6 changelog
- MySQL 5.5.23 / 5.1.63 for CentOS 5 changelog
The PHP 5.3 and 5.4 releases are to fix a security issue (CVE-2012-1823) in some CGI setups, which has been around for some time.