According to this new advisory on the Secunia website, rPath has updated more of their PHP packages and has marked the update as "moderately critical" to keeping your systems safe.
rPath has issued an update for multiple php packages. This fixes some vulnerabilities, where some have unknown impacts and others can be exploited by malicious, local users and malicious users to bypass certain security restrictions.
The original advisory has links to the updated versions and to references as to what has changed.
In its default configuration, rPath Linux 1 does not install php5 and is thus not vulnerable to these attacks; however, systems to which php5 has been added may be vulnerable to one or more of these attacks.