AgentCore Security: Gaps You Still Own

Amazon Bedrock AgentCore is presented as a strong AWS-native platform for enterprise AI agents, offering per-session microVM isolation, managed identities and credentials, Gateway-based tool authentication, and deterministic Policy controls for calls routed through the gateway. The review notes that customers retain responsibility for session-to-user binding, IAM and execution-role scoping, policy design, SDK patching, direct-runtime access restrictions, network configuration, and defenses against prompt injection and memory poisoning. In 2026, researchers reported that Code Interpreter Sandbox mode permitted public DNS queries, which BeyondTrust says AWS remediated in April, while AWS also patched two command-injection vulnerabilities in the Python SDK’s install_packages() helper, with version 1.18.1 or later recommended. The text advises using VPC network mode for sensitive code execution, restricting interpreter permissions and network access, logging activity, validating memory writes, and treating guardrail scores as probabilistic signals rather than deterministic authorization. It concludes that AgentCore may be sufficient for primarily AWS-based deployments, while organizations operating across multiple clouds, SaaS platforms, or on-premises environments may benefit from an independent gateway and audit layer, although the discussion of NeuralTrust products is explicitly promotional.

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