Do I need MCP security software?
If you run any MCP servers in production, yes. The April 2026 design-level RCE affected 200,000+ servers and the protocol's implicit-trust model gives every server full agent context. Securie's MCP trust-enforcement layer + mcp-scan (Invariant Labs) are the table-stakes defense.
MCP's protocol design optimised for fast local-tool dispatch and treated the server's catalog as authoritative. That implicit trust is exploitable in four ways (unknown-server smuggle, fingerprint drift, tool smuggle, scope escalation) — all four were demonstrated against production MCP deployments in the April 2026 wave.
Securie's MCP trust-enforcement layer is the runtime enforcement layer: a signed trusted-server catalog (operator-pinned allow-list) + the manifest validator (per-manifest invariant checks) + the per-dispatch scope check (O(1) per dispatch). It wires in at agent construction time, enabling MCP trust enforcement — no per-call code change.
Invariant Labs' open-source `mcp-scan` runs as a periodic fleet check + complements the runtime enforcement.