A2A East-West Traffic Blind Spot: Agent-to-Agent Communication Bypasses All Traditional Security Controls
Security Boulevard·medium signal
A2A inter-agent communication operates exclusively as east-west traffic inside cloud environments using internal, often undocumented APIs — invisible to WAFs and API gateways deployed at the perimeter. Primary attack vectors include agent card spoofing to inject prompt payloads into metadata, insufficient token lifetime controls, and over-broad access scopes enabling privilege escalation chains. Defense requires Generative Application Firewalls (GAFs) as airlocks between agents, not perimeter tooling.