Slackware has issued an update for php. This fixes some vulnerabilities, which can be exploited by malicious users to bypass certain security restrictions, and potentially by malicious people to cause a DoS (Denial of Service) or to compromise a vulnerable system.
Be sure to check if your system is missing security updates or have insecure applications installed:
http://secunia.com/software_inspector/
Feature Overview - The Secunia Software Inspector:
* Detects insecure versions of applications installed
* Verifies that all Microsoft patches are applied
* Assists you in updating your system and applications
* Runs through your browser. No installation or download is required.
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