Krux
March 8, 2026
Claude Opus 4.6 Found 22 Firefox Bugs in Two Weeks
Published: March 8, 2026 at 12:31 AM
Updated: March 8, 2026 at 12:31 AM
100-word summary
Anthropic's Claude Opus 4.6 just discovered 22 Firefox vulnerabilities in a two-week security sprint with Mozilla, including 14 high-severity flaws. The AI submitted 112 unique bug reports and contributed to patches now shipping in Firefox 148. What changed: Opus 4.6 can now reproduce historical CVEs, hunt for new bugs in live code, and even test patches. It generated two working exploits in controlled environments, though exploitation remains limited. The real breakthrough is speed. What used to require months of human auditing now happens in weeks, with the AI handling everything from discovery to triage. Security teams still validate every finding, but the model is turning open-source defense from a resource...
What happened
Anthropic's Claude Opus 4.6 just discovered 22 Firefox vulnerabilities in a two-week security sprint with Mozilla, including 14 high-severity flaws. The AI submitted 112 unique bug reports and contributed to patches now shipping in Firefox 148. What changed: Opus 4.6 can now reproduce historical CVEs, hunt for new bugs in live code, and even test patches. It generated two working exploits in controlled environments, though exploitation remains limited. The real breakthrough is speed. What used to require months of human auditing now happens in weeks, with the AI handling everything from discovery to triage.
Why it matters
Security teams still validate every finding, but the model is turning open-source defense from a resource bottleneck into a scalable workflow.