The Canadian rapper Tory Lanez was hospitalized on Monday after being attacked in the California prison where he is serving a 10-year sentence for shooting the hip-hop star Megan Thee Stallion, the authorities said.

Mr. Lanez, 32, whose real name is Daystar Peterson, was attacked by another prisoner on Monday morning at a prison in Tehachapi, near Bakersfield, the California Department of Corrections and Rehabilitation said in a statement.

Mr. Lanez was transported to a medical facility outside the prison, the department said. It did not provide further details about Mr. Lanez’s condition, but a statement posted on his Instagram account late Monday said that he had been stabbed 14 times.