A woman and her boyfriend were stabbed by her ex-boyfriend on Monday morning in Brooklyn, police said.

The man allegedly showed up at his ex-girlfriend’s home on Crystal Street near Glenmore Avenue in East New York around 9:30 a.m. and knifed both victims — stabbing the woman, 33, in the face and her new boyfriend, 53, in the torso, cops said.

The attacker, who police said is in his 50s, then fled the building. Authorities are still trying to find him.

The victims were taken to Brookdale University Hospital Medical Center, where they are expected to survive.