Looks like everyone with a Gmail account has something new to worry about. The unreleased, proof of concept vulnerability discovered by some security specialist can set filters on your inbox to block and/or automatically forward any email you receive. Weak.
Although the threat is labeled as serious at the moment, don’t worry. Google patches up vital holes pretty efficiently and there are no documented accounts of anyone actually falling prey to this. I’d say just check your filters every now and then.