Advisoriesby Ibismcp-toolboxGHSA-7pf3-8xx7-rvhf
MCP Toolbox for Databases vulnerable to DNS rebinding attacks
Fix: upgrade to 1.2.0 or later
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| github.com/googleapis/mcp-toolbox Go | < 1.2.0 | 1.2.0 |
Details and references
- CVSS 4.0
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-942
- Also known as
- CVE-2026-9739, GO-2026-5870
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