Claude Mythos Audited Symfony and Found 19 Vulnerabilities
Claude Mythos Preview, an AI model by Anthropic, conducted a security audit of Symfony and Twig, identifying 19 vulnerabilities. All reported vulnerabilities were confirmed as real by the Symfony Core Team, leading to immediate fixes in the latest security releases. This initiative highlights the evolving landscape of code security auditing through advanced AI technologies.
- ▪Claude Mythos Preview is a new AI language model by Anthropic, particularly strong in computer security tasks.
- ▪The model identified 19 real vulnerabilities in Symfony and Twig, all of which were addressed in recent security updates.
- ▪This audit is part of a broader trend where AI tools are revolutionizing code security assessments.
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Claude Mythos Audited Symfony and Found 19 Vulnerabilities May 21, 2026 • Published by Javier Eguiluz Claude Mythos Preview is a new general-purpose AI language model by Anthropic. This model performs strongly across the board, but it is especially strong at computer security tasks. This model is not publicly available yet, but Anthropic is making it available to selected tech projects via their Project Glasswing. Through this initiative, Claude Mythos has found thousands of security vulnerabilities, including some in every major operating system and web browser. Symfony recently teamed up with The PHP Foundation and Anthropic to build the official MCP SDK for PHP applications.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Symfony.
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