EXPLOIT-CVE-2026-42559

CVE-2026-42559 — DNS rebinding in the rmcp Streamable HTTP server transport A self-contained Docker lab and Python proof of concept for CVE-2026-42559 GHSA-89vp-x53w-74fx / RUSTSEC-2026-0189. | ---|--- Affected| rmcp — the official Rust SDK for the Model Context Protocol — 1.4.0 Fixed in| 1.4.0...

GHSA-9G45-5XWM-F3WC RMCP: Custom HTTP headers leak to cross-origin redirect targets

Summary The rmcp crate's StreamableHttpClientTransport forwards caller-supplied custom HTTP headers such as X-API-Key, X-Auth-Token, Api-Key to cross-origin redirect targets. The defaulthttpclient function builds a reqwest::Client without a redirect policy override, so the default limited10 polic...

EUVD-2026-81266

RMCP: Custom HTTP headers leak to cross-origin redirect targets...

vtcode-utility-tool-specs (>=0.134.1, <=0.141.9) potentially affected by CVE-2026-64684 via rmcp (2.0.0)

rmcp CARGO version 2.0.0 is affected by a known vulnerability. The following packages have a transitive dependency on rmcp and may be impacted: - vtcode-utility-tool-specs =0.134.1, =0.141.9 Source cves: CVE-2026-64684 Source advisory: OSV:GHSA-9G45-5XWM-F3WC...

RMCP: Custom HTTP headers leak to cross-origin redirect targets

Summary The rmcp crate's StreamableHttpClientTransport forwards caller-supplied custom HTTP headers such as X-API-Key, X-Auth-Token, Api-Key to cross-origin redirect targets. The defaulthttpclient function builds a reqwest::Client without a redirect policy override, so the default limited10 polic...

Linux Distros Unpatched Vulnerability : CVE-2026-64684

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in...

CVE-2026-64684

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in crates/rmcp/src/transport/common/reqwest/streamablehttpclient.rs builds its defaulthttpclient with reqwest's automatic redirect policy and applies caller-supplied values...

GHSA-9PJ6-VHGR-3MWH RMCP: Unauthenticated permanent session-table leak in rmcp Streamable HTTP server transport leads to remote denial-of-service

Summary An unauthenticated remote attacker can leak one entry per HTTP request out of the in-memory session table of LocalSessionManager by sending a well-formed JSON-RPC POST that is not an InitializeRequest. The Streamable HTTP server's handlepost allocates the session before it validates the...

RMCP: Unauthenticated permanent session-table leak in rmcp Streamable HTTP server transport leads to remote denial-of-service

Summary An unauthenticated remote attacker can leak one entry per HTTP request out of the in-memory session table of LocalSessionManager by sending a well-formed JSON-RPC POST that is not an InitializeRequest. The Streamable HTTP server's handlepost allocates the session before it validates the...

RMCP: Missing Resource Field Validation in OAuth Protected Resource Metadata Discovery

Summary The rmcp library does not validate the resource parameter in OAuth Protected Resource metadata RFC 9728, allowing a malicious MCP server to redirect OAuth flows to a legitimate authorization server and steal the resulting access tokens. Details RFC 9728 specifies two MUST requirements for...

GHSA-33F5-2C5Q-WGWJ RMCP: Missing Resource Field Validation in OAuth Protected Resource Metadata Discovery

Summary The rmcp library does not validate the resource parameter in OAuth Protected Resource metadata RFC 9728, allowing a malicious MCP server to redirect OAuth flows to a legitimate authorization server and steal the resulting access tokens. Details RFC 9728 specifies two MUST requirements for...

CVE-2026-64684

A flaw was found in the rmcp component. This vulnerability allows a remote attacker to disclose sensitive information. When the rmcp crate's HTTP client processes a redirect to a different web address cross-origin redirect from a malicious or compromised Model Context Protocol MCP endpoint, it ca...

CVE-2026-64684 RMCP: Custom HTTP headers leak to cross-origin redirect targets

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in crates/rmcp/src/transport/common/reqwest/streamablehttpclient.rs builds its defaulthttpclient with reqwest's automatic redirect policy and applies caller-supplied values...

CVE-2026-64684 RMCP: Custom HTTP headers leak to cross-origin redirect targets

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in crates/rmcp/src/transport/common/reqwest/streamablehttpclient.rs builds its defaulthttpclient with reqwest's automatic redirect policy and applies caller-supplied values...

CVE-2026-64684 RMCP: Custom HTTP headers leak to cross-origin redirect targets

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in crates/rmcp/src/transport/common/reqwest/streamablehttpclient.rs builds its defaulthttpclient with reqwest's automatic redirect policy and applies caller-supplied values...

CVE-2026-64684

RMCP , the official Rust SDK for the Model Context Protocol, is affected in StreamableHttpClientTransport (prior to version 2.1.0). The custom_headers configured via StreamableHttpClientTransportConfig are applied to the reqwest client without being marked as sensitive. When a malicious or compro...

CVE-2026-63127

A flaw was found in rmcp, a Rust SDK for the Model Context Protocol. The OAuth implementation in rmcp omits the RFC 9728 resource field from ResourceServerMetadata. This allows a malicious Model Context Protocol MCP server to publish metadata for a different legitimate MCP resource. Consequently,...

CVE-2026-63128

A flaw was found in rmcp, a Rust SDK for the Model Context Protocol. An unauthenticated remote attacker can send specially crafted JSON-RPC POST requests to the stateful Streamable HTTP server. These requests cause the server to create and permanently retain session and channel state without prop...

CVE-2026-63128

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.0.0, the rmcp crate's stateful Streamable HTTP server in crates/rmcp/src/transport/streamablehttpserver/tower.rs allows an unauthenticated client to send a well-formed JSON-RPC POST that is not an initialization request, or a...

CVE-2026-63127

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.0.0, the rmcp crate's OAuth implementation in crates/rmcp/src/transport/auth.rs omits the RFC 9728 resource field from ResourceServerMetadata and allows discoveroauthserverviaresourcemetadata to use protected-resource metadat...