AIKIDO-2026-49493
rmcp is vulnerable to Denial of Service (DoS)
75
High Risk
This Affects:
rmcpTL;DR
The Streamable HTTP server transport in crates/rmcp/src/transport/streamable_http_server/tower.rs allocates a session via create_session before it validates the request body in handle_post. An unauthenticated remote attacker can send a well-formed JSON-RPC POST that is not an InitializeRequest, which triggers an early return without calling close_session, permanently leaking one LocalSessionHandle entry per request from the in-memory session table. Sustained requests grow memory without bound and eventually exhaust the server, causing denial of service. The fix moves request validation before session creation so non-initialize requests are rejected without allocating session state.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application runs the rmcp Streamable HTTP server transport.
Background info
rmcp is vulnerable to Denial of Service (DoS) in versions 0.2.0 - 1.8.0.
How to fix this
Upgrade the rmcp library to the patch version.
Links
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