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#1 Schneier on Security threat-intel April 29, 2026 at 10:12 UTC

Claude Mythos Has Found 271 Zero-Days in Firefox

By Bruce Schneier

AI Summary

Claude Mythos has discovered 271 zero-day vulnerabilities in Firefox since February 2026, building on previous work with Opus 4.6 that found 22 security-sensitive bugs in Firefox 148. This represents an extraordinary scale of AI-assisted vulnerability discovery that demonstrates the potential for autonomous security research tools to uncover previously unknown flaws in critical software.

Read full article → https://www.schneier.com/blog/archives/2026/04/cla…

Relevance score: 95.0/100

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