This is what I would do.
The brine is overflowing the jar. What should I do?
It is quite normal for brine to be pushed up and out of the vessel during fermentation. If the airlock is full of brine, open the container and remove excess vegetables and brine. Then reseal the container. If fermenting in an open vessel, it’s helpful to set the container in a baking pan to catch overflow. To prevent future messes, be sure to leave plenty of headspace, especially with shredded vegetables.
http://www.culturesforhealth.com/lea...eshooting-faq/