I will present GUEB, a static tool looking for use-after-free and double free on binary code. I will first present how GUEB works in a theoretically point of view. Then I will explain some part of the implementation. I will make a live demo of the tool and show how everything works through reals exemplars of bugs found with it. The tool will become open source before the end of the conference, so everyone will be able to try it. I added a draft of slide of the presentation as support. I can added a short paper that shows some details about the demo that I want to perform during the presentation.