EXPLOIT-CVE-2026-42559

CVE-2026-42559 — rmcp Streamable HTTP 서버 전송의 DNS 리바인딩 CVE-2026-42559GHSA-89vp-x53w-74fx / RUSTSEC-2026-0189을 위한 독립형 Docker 랩 및 Python 개념 증명PoC입니다. | ---|--- 영향 범위| rmcp — Model Context Protocol용 공식 Rust SDK — 1.4.0 수정 버전| 1.4.0 2026-04-10 CWE| CWE-346 출처 검증 오류, CWE-350 CVSS 3.1| 8.8 High —...

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...

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 , 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-2026-64684 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-2026-63127

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...

CVE-2026-63127 RMCP: Missing Resource Field Validation in OAuth Protected Resource Metadata Discovery

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...