Anthropic’s Claude Mythos Preview Uncovers 10,000+ 0-Days in Project Glasswing

Anthropic's Project Glasswing leveraged the unreleased Claude Mythos Preview to autonomously find and even engineer exploits for over 10,000 high- and critical-severity zero-day vulnerabilities across major codebases (including CVE-2026-5194 in wolfSSL), reporting a high true-positive rate but noting that only a small fraction of vulnerabilities have been patched—creating a substantial exploit window and prompting restricted model release and defensive mitigation recommendations.