If its conclusion was procured by the threat or use of force in violation of the principles of the UN Charter.

If there is an error related only to the wording of the text of the treaty.

If the expression of a state’s consent to be bound by a treaty has been procured through the corruption of its representative by another negotiating state.

If at the time of its conclusion the treaty conflicts with a peremptory norm of general international law.

If the state's consent to be bound by the treaty has been expressed in violation of a provision of its internal law and this violation is manifest and concerns a rule of internal law of fundamental importance.