Anthropic Claude Mythos discovered 271 vulnerabilities in the Firefox browser

By: rootdata|2026/04/22 02:42:01

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According to Decrypt, Mozilla recently revealed that Anthropic's latest AI model, Claude Mythos, identified 271 security vulnerabilities during internal testing of the Firefox browser, and the related vulnerabilities have been fixed this week.

In comparison, a previous version of the Anthropic model only found 22 security-sensitive vulnerabilities. Mozilla stated that all discovered vulnerabilities were within the scope of top human researchers' findings. Claude Mythos was officially released in March 2026 and is Anthropic's most powerful model in the fields of reasoning, coding, and cybersecurity, currently available for use by vetted partners such as Amazon, Apple, and Microsoft through the "Project Glasswing" initiative.

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