The 2026 Guide to Post-Quantum AI Infrastructure Security: Securing MCP Deployments

This advisory warns that agentic AI infrastructures using the Model Context Protocol (MCP) are exposed to long-term "Harvest Now, Decrypt Later" risks and agent-based attack vectors (command injection, delegated permission abuse, context poisoning). It prescribes a five-layer defense-in-depth (PQC/mTLS identity, session isolation, data-level zero trust with Policy Enforcement Points, cryptographic agility, and continuous monitoring), a hybrid post-quantum migration approach, and phased operational roadmap for 2026—providing guidance rather than reporting an active incident.