Due process limits exceptions to nonparty nonpreclusion by ensuring that any application of claim preclusion to a nonparty meet rigorous standards. This includes notice of the original suit, an opportunity to be heard, and representation of their interests during proceedings.
For example: If an individual who was not a party in an initial lawsuit is to be bound by its judgment, they must have had notice and an opportunity to join or influence the case, perhaps through a guardian if they are unable to represent themselves due to age or incapacity.