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

271 vulnerabilities. That's what Claude Mythos Preview found in Firefox 150 — some lurking for 20 years. Mozilla's now running agentic AI on every code commit.

Reporting by The Decoder 1 min brief
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The KeyNews take

Why it matters

Mozilla deployed an agentic AI pipeline into production security workflows, moving beyond research into operational bug-finding at scale. This signals how enterprises are embedding AI agents into critical software delivery processes.

The key facts

5 to know

  1. Claude Mythos Preview discovered 271 previously unknown Firefox 150 vulnerabilities

  2. Vulnerabilities include bugs dormant for up to 20 years

  3. Agentic pipeline builds and runs its own test cases to filter false positives

  4. Mozilla implementing automatic code checks before commit for all new code

  5. Deployment date: May 8, 2026

Go to the source

The Decoderthe-decoder.com

Publisher excerpt: Anthropic's Claude Mythos Preview uncovered 271 previously unknown security vulnerabilities in Firefox 150, including bugs up to 20 years old. Mozilla describes an agentic pipeline where the AI builds and runs its own test cases to filter out false positives. Going forward, every new piece of code…
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