The PHP group has released the latest version of the PHP 4.4.x series today - PHP 4.4.6:
The PHP development team would like to announce the immediate availability of PHP 4.4.6. The main issue that this release addresses is a crash problem that was introduced in PHP 4.4.5. The problem occurs when session variables are used while register_globals is enabled. Details about the PHP 4.4.6 release can be found in the release announcement for 4.4.6, the full list of changes is available in the ChangeLog for PHP 4.
Head on over to your local downloads page to get this new release in either: