According to a new post on the main PHP site, they've released the latest version in the 4.4.x series - PHP 4.4.2.
The PHP development team is proud to announce the release of PHP 4.4.2. This release address a few small security issues, and also corrects some regressions that occurred in PHP 4.4.1. All PHP 4 users are encouraged to upgrade to this release.
Some of the things that this edition fixes includes: HTTP Response Splitting has been addressed in the header() function, an XSS problem inside the error reporting functionality has been removed, and Apache 2 regression with sub-request handling on non-Linux systems has been fixed.
So, head on over and grab this lastest distribution and upgrade today!