CVE-2026-42559highCWE-346CWE-350

CVE-2026-42559: fallo de gravedad alta en modelcontextprotocol rust-sdk

RMCP: DNS rebinding vulnerability in rmcp Streamable HTTP server transport

Publicada el

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Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.

21Vexday Risk Score

Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.

ssvc Trackcvss 8.8epss 0.3%
RMCP is an official Rust SDK for the Model Context Protocol. Prior to version 1.4.0, the rmcp crate's Streamable HTTP server transport (crates/rmcp/src/transport/streamable_http_server/) did not validate the incoming Host header. This allowed a malicious public website, via a DNS rebinding attack, to send authenticated requests to an MCP server running on the victim's loopback or private-network interface. This vulnerability is fixed in 1.4.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Productos afectados
modelcontextprotocol · rust-sdk
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