It’s once in a blue moon we see these, but there is a critical security flaw for the Safari browser. It’s a particularly bad flaw because it allows a malicious site to pretty much get anything to run on the remote machine. Fortunately, this can be easily avoided by turning off the option to automatically open safe files. There is no official patch yet, so this is your best option if you’re paranoid or you visit the shadier side of the International Webtron.
UPDATE: There’s another OS X security threat out there too. This spreads by iChat and Bluetooth which makes it’s threat to the general Mac populace pretty low and is still in a benign form.
(via T3h M0th3r . . of all people)