Mozilla Used Anthropic’s Mythos to Find and Fix 271 Bugs in Firefox
infonewsLLM-Specific
securityindustry
Source: Wired (Security)April 21, 2026
Summary
Mozilla used early access to Anthropic's Mythos Preview, an AI tool for finding software vulnerabilities, to identify and patch 271 bugs in Firefox 150. The company believes AI-powered vulnerability hunting represents a major shift in cybersecurity, since attackers will eventually have access to these same capabilities, making it urgent for all software developers to proactively find and fix bugs before malicious actors do.
Classification
Attack SophisticationModerate
Impact (CIA+S)
integrity
AI Component TargetedAPI
Affected Vendors
Anthropic
Related Issues
Monthly digest — independent AI security research
Original source: https://www.wired.com/story/mozilla-used-anthropics-mythos-to-find-271-bugs-in-firefox/
First tracked: April 21, 2026 at 08:00 PM
Classified by LLM (prompt v3) · confidence: 85%