Back window seal is defective or not keeping water out

Is there any type of warranty that covers this issue? I feel like this is something the dealership should have taken care of before the vehicle was sold. My vehicle now smells like mildew and my family and I ride around in this vehicle. We’ve been having some really bad rain that’s how I noticed it. I feel like this is something that should be covered under a warranty by the dealership or the manufacturer like I said this should’ve been taken care of before the car was allowed off the lot.