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A Vault with a Heap-View: The Uncomfortable Space Between AgentCore Harness and Identity

September 18, 2026 · Unit 42 · Severity: LOW

Analysis of how default configurations in AWS AgentCore Harness allow prompt injection to exfiltrate credentials, and key steps to secure your agents. The post A Vault with a Heap-View: The Uncomfortable Space Between AgentCore Harness and Identity appeared first on Unit 42.

Key Takeaways

  • Unit 42 analyzed how default configurations in AWS AgentCore Harness allow prompt injection attacks to exfiltrate credentials, exposing a dangerous gap between agent orchestration and identity management.
  • The analysis provides key steps for securing AI agents running on AWS, including implementing proper input validation, restricting agent permissions, and separating identity contexts between the harness and the agent.
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