Yes there is an attack.
It´s the fourth if my count is right during the past few weeks.
copypaste from reddit:
"vbuterinJust some guy 63 points 1 day ago*
Yeah, it's a new attack contract. Though this time the blocks are still processing fine and the slowdown is less than 1 order of magnitude compared to 1.5m gas of regular usage (edit: at least, 1.5m gas of regular usage at the time I made the measurements back in 2015; the VM has been further optimized since then), so I am not worried. Once we optimize this one a bit more I personally would feel comfortable advising miners to start raising the gas limit.
Edit: fix here
https://github.com/ethereum/go-ethereum/pull/3067".