Here are updated packages in the Yum repository:

• PHP 5.3.29-4 for RHEL/CentOS 5.11 changelog

Note PHP.net has EOL'd (End of Life) PHP 5.3, however this Webtatic release contains the latest security fixes since then.

The PHP 5.3.29-4 security release fixes 3 CVEs
* CVE-2014-8142
* CVE-2015-0231
* CVE-2015-0232