MCP Toolbox for Databases vulnerable to DNS rebinding attacks
GHSA-7pf3-8xx7-rvhf · CVE-2026-9739 · GO-2026-5870
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Description
Vulnerable to DNS rebinding attacks when using SSE (http://b/499408790). During the beta phase, we implemented allowed-origins and allowed-hosts flags to align with MCP security guidelines. However, the hardcoded Access-Control-Allow-Origin: * header in the SSE initialization handler was inadvertently retained. This vulnerability specifically impacts users connecting via Toolbox using SSE under specification v2024-11-05.
References
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-9739
- WEB https://github.com/googleapis/mcp-toolbox/issues/3053
- WEB https://github.com/googleapis/mcp-toolbox/pull/3054
- WEB https://github.com/googleapis/mcp-toolbox/commit/c4c7bd917e686de68e2be866cfe3872c3439efae
- PACKAGE https://github.com/googleapis/mcp-toolbox
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