CVE Watch16 sept 2026

CVE-2026-63128

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.0.0, the rmcp crate's stateful Streamable HTTP server in crates/rmcp

CVSS

7.5

Alto

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 16 sept 2026 · Última mod.: 16 sept 2026 · CWE-400 · CWE-401 · CWE-772

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.0.0, the rmcp crate's stateful Streamable HTTP server in crates/rmcp/src/transport/streamable_http_server/tower.rs allows an unauthenticated client to send a well-formed JSON-RPC POST that is not an initialization request, or an initialization request with a mismatched protocol header, causing StreamableHttpService::handle_post to call LocalSessionManager.create_session before validating the message. An early validation failure returns without removing the inserted LocalSessionHandle from LocalSessionManager.sessions, permanently retaining session and channel state for the server process lifetime. Repeated requests can grow the shared session table without bound, degrade legitimate-client latency through lock contention, exhaust memory, and terminate the server. This issue is fixed in version 2.0.0.

Referencias oficiales

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