Our site analytics tool (we use Google Analytics) has shown a huge influx of Safari users (about 40% of all users, which is more than Chrome's 36%!), with over 17,000 of them reported as being on Safari version 537.36. The most recent version as of this writing is Safari 10.0.2 (and we only get about 2,500 users on 10.0.x).
We're really surprised by this development. Which version of Safari has the user agent string "Safari/537.36"?