Rein Security raises $25M to rein in insecure AI agents

Rein Security Inc. said today it’s trying to help enterprises protect themselves against two distinct security threats relating to agentic artificial intelligence after raising $25 million in early-stage funding from Glilot Capital, Sienna Venture Capital, Corner Ventures, Atlacle and RNP Capital Advisors today.

The Series A round, which brings Rein’s total amount raised so far to $35 million, comes at a time when the risks of AI agents have become more acute than ever. In fact, the startup argues that autonomous agents bring two entirely new types of risks that enterprises have never had to deal with before, which means there’s no hope that their existing cybersecurity platforms are going to be able to protect them.

For enterprises that are adopting AI agents themselves, the big challenge is to secure those digital workers and make sure they don’t unwittingly cause problems or leak crucial secrets. And for everyone else, regardless of whether they’re using agents, they’re going to need to learn how to protect their information technology infrastructure from sophisticated, hacker-controlled agents, which are capable of continuously probing organizations’ defenses to search for vulnerabilities they can exploit.