Visa ships a security AI that patches production code before any human reviews it

Visa released the open-source Visa Vulnerability Agentic Harness (VVAH), which automatically scans code, generates patches, and validates them without human review, extending the pipeline to discover, verify, remediate, validate, and iterate fixes. The tool, built on Anthropic’s Claude Mythos and now featuring abstract-syntax-tree analysis and MTTA observability, claims to reduce resolution times from weeks to hours and has attracted high-profile adopters, garnering over 2,300 GitHub stars.