PHP versions 4.3.11 and 5.0.4 have just been released and include fixes for numerous security holes, and a resolution for the performance issue that affects vBulletin as I described here.
We would recommend that all customers upgrade to either 4.3.11 or 5.0.4 at their earliest convenience.
We would recommend that all customers upgrade to either 4.3.11 or 5.0.4 at their earliest convenience.