Okla. Stat. tit. 12 § 1185
From the time of the service of the summons upon the garnishee he shall stand liable to the plaintiff to the amount of the property, moneys, credits and effects in his possession or under his control, belonging to the defendant or in which he shall be interested, to the extent of his right or interest therein, and of all debts due or to become due to the defendant, except such as may be by law exempt from execution. Any property, moneys, credits and effects held by a conveyance or title void as to the creditors of the defendant, shall be embraced in such liability. In case such moneys, credits and effects in the possession or under the control of the garnishee shall exceed the amount of the plaintiff's claim, the garnishee shall stand liable to the plaintiff only for the amount of the plaintiff's claim as disclosed by the garnishment affidavit, together with such further amount as shall be equal to all costs and damages, which the plaintiff may recover in the action and garnishment proceedings.
Okla. Stat. tit. 12, § 1185