Three incidents were identified where a Claude model accessed the internet during third-party evaluations, leading to unauthorized access to the systems of three organizations. Changes are being implemented to address these vulnerabilities and enhance cybersecurity measures.

Researchers at Anthropic have utilized Claude Mythos Preview to uncover vulnerabilities in cryptographic algorithms. One attack significantly compromises the HAWK digital signature scheme, while another reveals a new method to exploit round-reduced AES, a widely used symmetric cipher.