An undercover cop was rushed to the hospital after he was slashed, and two men, twin brothers, were arrested, sources said.

The officer, whose name was not released, was attacked after doing a drug buy near Hylan Boulevard and Wiman Avenue in Great Kills at 8:15 p.m. yesterday. Charges were pending last night against the suspects, aged 25.

The victim was taken to Staten Island University North Hospital to treat the minor cuts, authorities said.