A 36-year-old woman was slashed by a blade-wielding madman in a Lower East Side subway station early Sunday morning, the NYPD said.

Following a 911 call, officers found the unidentified victim — who was cut at the Delancey Street/Essex Street station — with a laceration on her left leg, a department spokesperson said Sunday.

Authorities brought her to Bellevue Hospital, where she is in stable condition.

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Police aren’t sure what precipitated the attack, and could not say if it was unprovoked.

They described the suspect as a man wearing a navy blue bag and blue hat. He fled on a southbound J train following the attack, cops said.

Police haven’t made any arrests. The investigation is ongoing, they added.