Forensic Summary
Mozilla used early access to Anthropic's Claude Mythos model to systematically discover and patch hundreds of previously unknown vulnerabilities in Firefox, including bugs over 15–20 years old. The effort demonstrates a step-change in AI-assisted vulnerability research, with April 2026 seeing 423 security fixes compared to a monthly baseline of 20–30. The same capability that empowered Mozilla's defenders also signals that adversaries with similar model access could industrialise exploit discovery against open-source software at scale.
Read the full technical deep-dive on Grid the Grey: https://gridthegrey.com/posts/ai-assisted-fuzzing-uncovers-423-firefox-security-bugs-in-one-month/
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