A teen was viciously stabbed early Saturday outside his family’s Brooklyn home by a man who just got into a fender bender with his dad, authorities said.

The accident happened around 2 a.m. near 60th Street and Fourth Avenue in Sunset Park, when a man driving a BMW collided with a the driver of a white Cadillac, according to police.

The drivers exchanged insurance information, but the Cadillac driver continued the confrontation at the man’s home, which was right near the accident site, police said.

The man’s 19-year-old son came outside and was attacked by the incensed Caddy driver, who stabbed him multiple times in the neck and chest, according to police.

A neighbor, who said he was woken up by “girls screaming,” came outside to find the teen badly bleeding.

“He really looked like he was dying,” said the witness, who declined to provide his name. “Everybody was full of blood. They were trying to stop the bleeding.”

A woman wearing a blood-soaked shirt was seen in a video taken by a bystander speaking to a detective, and the pavement was splattered with blood.

The attacker drove off, and the teen was taken to NYU Langone Hospital, where he was listed in stable condition Saturday evening, police said.