Defending Against Mythos Equipped Adversaries In the last couple of weeks, I have heard from many CISOs and security professionals about their concerns about defending against adversaries equipped with Mythos. Anthropic Claude Mythos has found thousands of vulnerabilities in major operating systems and browsers, including chained exploits in the Linux kernel and remote code execution (RCE) in one of the most hardened operating systems (OpenBSD). One of the key advances in Claude Mythos is the ability to find **unknown exploits (or zero days)**. The model's advanced reasoning capabilities highlight its ability to find novel exploits in both open- and closed-source software. By definition, a zero-day exploit **does not have an associated patch available** when it is discovered. As a result, **patching the system is not a practical option** when the defender faces attacks that exploit zero-day vulnerabilities. There would be **no patch available** to apply.…