Spencer Stone, one of the 3 American heroes who thwarted the terrorist attack in France, was stabbed multiple times ... and is now hospitalized.
The attack reportedly happened early Thursday morning in Sacramento while Stone was protecting a friend. Stone was stabbed 4 times in the chest while standing on a street corner.
The 23-year-old U.S. airman 1st class is reportedly in stable condition.
Stone, Alek Skarlatos, and Anthony Sadler were deservedly hailed as heroes back in August after they disarmed a would-be terrorist on a Paris-bound train.
Skarlatos just escaped tragedy last week by a twist of fate. He was enrolled to attend classes at Umpqua Community College in Oregon, and would have been there when the mass shooting happened ... if he hadn't decided to do "Dancing with the Stars" at the last minute.