modelcontextprotocol/rust-sdk

modelcontextprotocol/rust-sdk

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The official Rust SDK for the Model Context Protocol
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CVE History

CVEAffectedPublishedCVSS v3CVSS v2
CVE-2026-42559NVD↗
—8.8 HIGH—

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.