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

Rein Security Inc. has secured $25 million in early-stage funding from various venture capital firms to address the security risks posed by agentic artificial intelligence. This funding brings Rein's total amount raised to $35 million and comes at a time when the risks associated with AI agents have become increasingly significant. The startup argues that autonomous agents introduce entirely new types of security threats that existing cybersecurity platforms are ill-equipped to handle.

Rein Security's core mission is to secure AI agents with a proactive approach that focuses on prevention and protection at the execution layer. The company's platform is deployed as a lightweight sidecar that operates directly at runtime, analyzing various aspects of AI agent behavior, such as user prompts, API calls, and database access.

By creating a baseline of each agent's normal behavior, Rein Security can identify deviations and prevent malicious actions in real-time, all while allowing the agent's workflow to continue uninterrupted.

The co-founders and chief executives, Matan Bar-Efrat and Netanel Rubin, emphasize that the risks are entirely new and hidden from most security teams. AI agents are designed to carry out tasks without considering the potential negative consequences of their actions, making them particularly dangerous. To address this, Rein Security's platform micro-segments the resources an agent can interact with and enforces action-level controls at the point of execution.

Rein Security's approach to securing AI agents is focused on understanding the agent's legitimate behavior and flagging any deviations immediately. This method is more effective than trying to predict every possible attack technique, as attackers constantly find new ways to manipulate AI systems. The company's platform has already been deployed by several enterprises, including Flex Ltd., Swimlane Inc., Lemonade Inc., and Dun & Bradstreet Holdings Inc., to secure thousands of AI agents executing millions of actions weekly.

With the new funding, Rein Security aims to continue its global hiring push and expand its product research efforts to stay ahead of the rapidly evolving AI security landscape. The company is well-positioned to help enterprises navigate the challenges of deploying AI agents securely, as they become increasingly essential to modern business operations.