Visa's autonomous security tool now writes and self-tests patches before human sign-off

Visa has released an open-source security harness that automatically detects vulnerabilities, generates fixes, and runs an adversarial review on its own patch before any human involvement. The system, which operates by default across 11 stages, can edit source files in the target repository unless operators restrict it to detection only. The announcement also expands Visa's consulting advisory practice, arriving 18 days after a demonstration of GhostJacking at DEF CON 34.