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RMCP: DNS rebinding vulnerability in rmcp Streamable HTTP server transport

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Dated risk observations

Risk history is separate from CNA/OSV content history. Daily score drift is retained but only an upward crossing of 10% triggers the prediction change event.

Immutable source observations

8 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

28 Oct 2026 05:14:50 UTC

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 allow…

euvd · EUVD-2026-30292 · Published

27 Oct 2026 11:12:04 UTC

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 allow…

nvd · CVE-2026-42559 · Published

25 Oct 2026 10:17:15 UTC

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 allow…

nvd · CVE-2026-42559 · Published

24 Oct 2026 13:19:54 UTC

rmcp Streamable HTTP server transport has a DNS rebinding vulnerability

osv · GHSA-89vp-x53w-74fx · Published

24 Oct 2026 13:19:54 UTC

DNS rebinding and cross-origin CSRF in dynoxide's MCP HTTP transport

osv · RUSTSEC-2026-0140 · Published

24 Oct 2026 13:19:54 UTC

DNS rebinding vulnerability in rmcp Streamable HTTP server transport

osv · RUSTSEC-2026-0189 · Published

24 Oct 2026 13:17:17 UTC

dynoxide: DNS rebinding and cross-origin CSRF via MCP HTTP transport

osv · GHSA-fvh2-gm75-j4j7 · Published

23 Oct 2026 15:48:27 UTC

RMCP: DNS rebinding vulnerability in rmcp Streamable HTTP server transport

cve-program · CVE-2026-42559 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 28 Oct 08:36 UTC · 272 of 272 readable · 268 fully read · documentation 469/469 current