Officers responded to a report of a fight in progress inside a home at 1112 Newbridge St. at 3:21 a.m.
When they arrived, they found a resident suffering from multiple stab wounds, police said. The victim was treated at the scene then taken to a hospital, where he was listed in critical but stable condition.
No arrests have been made in the case, and police have not yet established a motive for the stabbing.
Anyone with information on the case is asked to call police dispatch at (650) 321-1112. Those wishing to remain anonymous can call or text (650) 409-6792, or send an email to epatipnow.org.