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                "id": "CVE-2026-42559",
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          "value": "RMCP is an official Rust SDK for the Model Context Protocol. Prior to version 1.4.0, the rmcp crate\u0027s 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\u0027s loopback or private-network interface. This vulnerability is fixed in 1.4.0."
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          "name": "https://github.com/modelcontextprotocol/rust-sdk/security/advisories/GHSA-89vp-x53w-74fx",
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        "advisory": "GHSA-89vp-x53w-74fx",
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    "dateReserved": "2026-04-28T16:56:50.192Z",
    "dateUpdated": "2026-05-14T16:00:33.149Z",
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