Rear window shattered without previous damage or impact of any object. Vehicle was parked in the middle of a garage, temperature was 32F and driver was present during event. Heard loud noise followed by rear glass shattering and fragments flying all the way to back seat passengers. Nobody was hurt, but glass shards had to be removed from their hair/ clothing. Problem has not been reproduced in dealership, but multiple reports for same vehicle have been filed online. Vehicle has not been inspected by insurance, as they will not cover it. There were no warning signs, or evidence of malfunction. Glass was inspected that same day before driving, had no cracks or breaks. Rear wiper was off when this happened.