Hex Security

Hex Security is a Y Combinator-backed company that agentic Offensive Security at Scale. The company participated in the Winter 2026 batch of Y Combinator.

Hex Security builds AI agents that run continuous penetration tests against your apps and infrastructure. Instead of a once-a-year penetration test, Hex Security's agents works 24/7 to find and verify critical vulnerabilities so you can prevent them before attackers.

Hex Security was part of Y Combinator's Winter 2026 cohort, has a team of approximately 3 employees, and is actively operating.