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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Wed, 29 Jul 2026 20:30:00 +0000
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Wed, 29 Jul 2026 19:30:00 +0000
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| 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. | |
| Title | MCP Ruby SDK: Streamable HTTP transport lacks DNS-rebinding (Host/Origin) protection | |
| Weaknesses | CWE-346 CWE-350 |
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-29T19:35:10.375Z
Reserved: 2026-07-15T16:54:55.816Z
Link: CVE-2026-63118
Updated: 2026-07-29T19:35:05.445Z
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OpenCVE Enrichment
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