Security Bulletin FSC-2006-4 was released today in regard to several F-Secure Anti-Virus products. The bulletin and issued hotfixes address two separate scenarios that can both lead to malware bypass.
Home users of our products will receive hotfixes automatically and will not need to take individual action. System administrators will want to read the bulletin to determine if any of the patches are necessary, and then apply them to their systems.
Our guidance here is the same as for patches from any other vendor: Patch now before there is an exploit for the vulnerabilities.