YC W26 Demo Day: Hex Security is building AI agents that act as automated penetration testers, continuously probing company infrastructure for vulnerabilities to prevent cyberattacks. The startup claims it crossed 1M USD run-rate revenue in just eight weeks. Investors were reportedly 'fighting' to invest. https://techcrunch.com/2026/03/28/from-moon-hotels-to-cattle-herding-8-startups-investors-chased-at-yc-demo-day/ #Tech #Startup #News #AISecurity #HexSecurity