Just exactly how much overfilled is it?? Where on the dipstick is the oil line? 6mm over the full mark? 15mm? 30mm? 6mm is not so much a problem. Everything else is.
Drain out the excess before it destroys your engine. The excess is likely being forced out the dipstick tube. You think you put in the wrong oil (did you read your owners manual, or the oil filler cap that tells you the proper weight oil??) Drain it ALL out and refill the proper amount and then monitor the car to see if the leak goes away. If not, get it in for service.