CRITICAL
GHSA-7pf3-8xx7-rvhf
MCP Toolbox for Databases vulnerable to DNS rebinding attacks
Details
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.
Are you affected?
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Affected packages
Go / github.com/googleapis/mcp-toolbox
Introduced in:
0 Fixed in: 1.2.0 Fix
go get github.com/googleapis/mcp-toolbox@v1.2.0 References
- https://nvd.nist.gov/vuln/detail/CVE-2026-9739 [ADVISORY]
- 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 [WEB]
- https://github.com/googleapis/mcp-toolbox [PACKAGE]