Apple today released Safari 8.0.6 which is recommended for all OS X Yosemite users.
Safari 8.0.6 contains improvements to security.
Apple today also released Safari 7.1.6 and Safari 6.2.6 for users of earlier OS X versions.
For detailed information on the security content of the Safari updates, visit: https://support.apple.com/en-us/HT201222