Nvidia offer an open source Jailbreak classifier on HuggingFace called NemoGuard Jailbreak Detect. These classifiers are heavily used by a range of guardrail systems and are designed to enable developers of AI applications to detect and react to incoming prompt injections and jailbreaks. We successfully demonstrated how an attacker can fully evade, or greatly degrade, classification accuracy of the classifier, enabling prompt injections and jailbreaks to pass through filters and subsequently to the protected AI application.