# Mythos claims to have found thousands of vulnerabilities across open-source and closed-source programs.

*genai · news · 2026-04-13 · Fortune*

## Key points

- Mythos discovered a vulnerability in OpenBSD that went undetected for 27 years.
- Anthropic claims Mythos found thousands of high- and critical-severity vulnerabilities in various software.
- Over 99% of vulnerabilities found by Mythos remain unpatched, according to Anthropic's own blog post.
- Mythos is only available to 40 organizations, including Microsoft, Apple, Google, and JPMorgan Chase.
- A security lapse exposed details about Mythos in a publicly accessible database before its official announcement.

**Companies:** Microsoft, Apple, Google, CrowdStrike, JPMorgan Chase
**Countries:** United States, China

[Read the full story on Fortune](https://fortune.com/2026/04/13/cybersecurity-anthropic-claude-mythos-dario-amodei-tech-ceo/)

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