On the main PHP.net site they've announced the latest releases of all currently supported versions of the language: PHP 5.5.35, 5.6.21 and 7.0.6. These are bugfix released with, among several others, security related corrections.

The PHP development team announces the immediate availability of PHP [5.5.35, 5.6.21 and 7.0.6]. This is a security release. Several security bugs were fixed in this release.

The PHP 7 release fixes two newly identified vulnerabilities: CVE-2016-3078 (Zip handling) and CVE-2016-3074 (GD functionality). As these are security releases it is highly recommended that you upgrade your current installations as soon as possible. You can get these latest versions from the main PHP.net downloads page or from windows.php.net for the Windows binaries.