Security Advisory

CVE-2026-63118

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-29 19:07:33

Last updated 2026-07-29 19:35:10

Assigner GitHub_M

CVSS score not scored

State PUBLISHED

Description

MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to 0.23.0, MCP::Server::Transports::StreamableHTTPTransport in the mcp gem does not validate the HTTP Host or Origin request headers, which allows a malicious browser page to use DNS rebinding to reach a locally running MCP server and invoke exposed tools. This issue is fixed in version 0.23.0.

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