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fix(network): refuse protocol upgrades on JSON-RPC and MCP endpoints #3753

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Merged
johntmyers merged 2 commits into from
Sep 28, 2026
+775 −29
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fix(network): refuse protocol upgrades on JSON-RPC and MCP endpoints #3753

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529b657
fix(network): refuse protocol upgrades on JSON-RPC and MCP endpoints
shiju-nv Sep 23, 2026
5b9a482
docs(observability): remove duplicate protocol error definition
shiju-nv Sep 28, 2026
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5 changes: 4 additions & 1 deletion architecture/security-policy.md
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Original file line number Diff line number Diff line change
Expand Up @@ -113,7 +113,10 @@ allowing them to continue under stale authorization. HTTP upgrades switch to
raw relay by default. A `protocol: rest` endpoint can opt in to
`websocket_credential_rewrite` for client-to-server WebSocket text messages
after an allowed `101` upgrade; server-to-client traffic and all other upgraded
protocols remain raw passthrough.
protocols remain raw passthrough. JSON-RPC and MCP endpoints refuse every
request that carries an `Upgrade` header with `403` before forwarding,
whatever the enforcement mode, because their rules apply to individual HTTP
requests and a raw relay would bypass them.

A `protocol: tcp` hostname is a connection-routing constraint, not an
application-authority boundary. Transparent capture validates the approved DNS
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