Résumé : In its judgment in Pringle, delivered on November 27, 2012, the Court of Justice of the European Union upheld the establishment of the European Stability Mechanism through the conclusion of an international agreement by Euro Area Member States. Beyond its implications for the Union's economic and monetary policy, this landmark judgment offers food for thought on a series of central issues in EU constitutional law, including the scope of the simplified revision procedure in art.48(6) TEU or Member State co-operation and the use of EU institutions outside the EU legal order. It also constitutes a unique illustration of multi-level dialogue in the European Union in the post-Lisbon era.