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Mozilla's agentic AI pipeline turns Claude Mythos Preview loose and finds 271 unknown Firefox vulnerabilities

Mozilla used Anthropic's Claude Mythos Preview with an agentic pipeline to uncover 271 unknown vulnerabilities in Firefox 150, including bugs up to 20 years old. The pipeline lets the AI build and run its own test cases to filter false positives. Mozilla plans to integrate it to automatically check all new code before commit.

SourceThe DecoderAuthor: Maximilian Schreiner
Mozilla's agentic AI pipeline turns Claude Mythos Preview loose and finds 271 unknown Firefox vulnerabilities
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Under the source content permission, this page provides an editorial summary, key points, and a link to the original article.

Key points and analysis

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EngineersIntermediate

Key points

  • Mozilla used Claude Mythos Preview with an agentic pipeline to find and fix 271 previously unknown vulnerabilities in Firefox 150.
  • The AI autonomously writes and runs test cases to verify bugs, dramatically reducing false positives.
  • Some discovered bugs were 15-20 years old, and existing defenses like prototype pollution protection were validated.
  • Mozilla will integrate this pipeline to automatically check all new code before commit.

Highlights and analysis are generated automatically and may contain errors. Check the original source.

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