Claude Mythos Preview, Anthropic's unreleased model, audited Symfony and Twig code and reported 19 vulnerabilities. All of them turned out to be real.

The Symfony Blog provides updates, tutorials, and insights on Symfony, a popular PHP framework for building web applications. Covering topics such as framework features, best practices, and community updates, the blog offers resources for Symfony developers looking to enhance their skills and stay up-to-date with the latest developments in the Symfony ecosystem. Developers can learn how to leverage Symfony's powerful features and conventions to build robust and maintainable web applications that meet the demands of modern web development.

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Anthropic's unreleased Claude Mythos Preview model audited the Symfony and Twig PHP codebases through Project Glasswing and identified 19 security vulnerabilities — all confirmed real with zero false positives. Each finding included CWE classification, affected files, exploitation steps, a reproducer, and a suggested fix. Symfony has already patched all 19 issues in its latest security releases. The post reflects on how AI-powered security auditing is transforming traditional code review processes.

Claude Mythos Audited Symfony and Found 19 Vulnerabilities (Symfony Blog)