Apple just released the Safari 8.0.4 for users.
The update of the browser is recommended for everyone who is running OS X Yosemite, containing stability and security improvements. For more detailed information on the security content of the update, visit this link.
Update, by Rafael Fischmann · 03/18/2015 s 13:46
They also left the Safari 7.1.4 for OS X Mavericks users and the Safari 6.2.4 for OS X Mountain Lion.
Apple has published a support article detailing all security fixes brought by them.