N.Y. Civil Practice Law & Rules § 3022 (2026)

Rule 3022.  Remedy for defective verification. A defectively verified
pleading shall be treated as an unverified pleading.  Where a pleading
is served without a sufficient verification in a case where the adverse
party is entitled to a verified pleading, he may treat it as a nullity,
provided he gives notice with due diligence to the attorney of the
adverse party that he elects so to do.