Claude Mythos signals a new era in AI-driven security, finding 271 flaws in Firefox
Summary
Claude Mythos, an AI model from Anthropic, discovered 271 vulnerabilities in Firefox 148, more than ten times what previous AI tools found, demonstrating AI's growing ability to uncover security bugs at scale. All 271 flaws were fixed in Firefox 150's release. While the AI isn't finding entirely new types of bugs, it's closing gaps in vulnerability detection that fuzzing (automated testing that uncovers bugs in source code) and human teams had previously missed, potentially shifting the balance in favor of defenders.
Solution / Mitigation
All 271 vulnerabilities discovered in Firefox 148 have been fixed in Firefox 150.
Classification
Affected Vendors
Related Issues
Original source: https://www.csoonline.com/article/4162259/claude-mythos-signals-a-new-era-in-ai-driven-security-finding-271-flaws-in-firefox.html
First tracked: April 23, 2026 at 02:00 AM
Classified by LLM (prompt v3) · confidence: 92%