The PHP development team announces the immediate availability of PHP 5.5.1. About 20 bugs were fixed including a security fix in the XML parser (Bug #65236). For source downloads of PHP 5.5.1 please visit our downloads page, Windows binaries can be found on windows.php.net/download/. The list of changes is recorded in the ChangeLog.
Other fixes included changes for bugs in the Opcache, CLI test webserver, DateTime, PDO (OCI8 and Pgsql) and Phar.