Just yesterday, Apple rolled out a Safari update for OS X Yosemite, OS X Mavericks, and OS X Mountain Lion. The update is dubbed version 8.0.6, 7.1.6, and 6.2.6 respectively for each OS version.
The update can be downloaded from the Updates page in the Mac App Store app.
Originally Posted by Apple:-
This update is a must for all users as it comes with important security enhancements.