Upgrade github.com/modelcontextprotocol/go-sdk to fix DNS rebinding vulnerability#172
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nathanjcochran
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github.com/modelcontextprotocol/go-sdk to fix DNS rebinding vulnerability
murrayju
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Jun 25, 2026
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Upgrades
github.com/modelcontextprotocol/go-sdkfromv1.2.0tov1.6.1.v1.2.0did not enable DNS rebinding protection by default for HTTP-based MCP servers, which let a malicious website reach the local Tiger MCP HTTP server (tiger mcp start http) and invoke Tiger Cloud tools using the server-held credentials. The SDK enabled localhost DNS rebinding protection by default as ofv1.4.0, so this is fixed by the version bump alone — no source changes are needed. Requests arriving on a loopback address with a non-localhostHostheader (the shape of a rebound browser request) are now rejected with403, while legitimate localhost clients are unaffected.See the go-sdk
v1.4.0release notes (under "Introduced DNS rebinding protection") for details on the upstream fix: https://github.com/modelcontextprotocol/go-sdk/releases/tag/v1.4.0