AnalysisCybersecurityJuly 28, 2026

Visa open-sources harness used to hunt bugs in payment network with Claude Mythos

Visa used Anthropic's Claude Mythos to hunt for bugs in its payment network, which spans 200+ countries, moves money in ~160 currencies, and connects nearly 5 billion credentials to 175M+ merchants. The company then open-sourced the harness that made the bug-hunting possible.

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