Security Advisory

CVE-2026-42559

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-14 14:24:56

Last updated 2026-05-14 16:00:33

Assigner GitHub_M

CVSS score 8.8

State PUBLISHED

Description

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.

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