New serious vulnerabilities spiked around release of Claude Mythos Preview
22 days ago
- In April 2026, Anthropic announced its Claude Mythos Preview model capable of autonomous cybersecurity vulnerability discovery and exploitation.
- Anthropic and OpenAI then began using frontier models to harden critical software before malicious actors could use the same models for harm.
- The number of Common Vulnerabilities and Exposures (CVEs) increased significantly after these announcements.
- High- and critical-severity vulnerabilities increased more than 3.5 times in June compared to the previous monthly record before the Mythos Preview announcement.