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CVE-2026-9739

Quick assessment

Affected
Google MCP Toolbox for Databases
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google MCP Toolbox for Databases是美国谷歌（Google）公司的一个开源的模型上下文协议（MCP）服务器。 Google MCP Toolbox for Databases存在安全漏洞，该漏洞源于使用SSE时容易受到DNS重新绑定攻击，且硬编码的Access-Control-Allow-Origin: *标头被无意保留，可能导致安全限制被绕过。

AI Predicted 4.3 Difficulty: Easy EPSS 0.28% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Google MCP Toolbox for Databases < PR 3054 (Fix CORS bypass) affected
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I. Basic Information for CVE-2026-9739

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
过度许可的跨域白名单
Source: CVE Program / CVE List V5
Vulnerability Title
Google MCP Toolbox for Databases 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google MCP Toolbox for Databases是美国谷歌（Google）公司的一个开源的模型上下文协议（MCP）服务器。 Google MCP Toolbox for Databases存在安全漏洞，该漏洞源于使用SSE时容易受到DNS重新绑定攻击，且硬编码的Access-Control-Allow-Origin: *标头被无意保留，可能导致安全限制被绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Google MCP Toolbox for Databases 0 ~ PR 3054 (Fix CORS bypass) -

II. Public POCs for CVE-2026-9739

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III. Intelligence Information for CVE-2026-9739

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Patches & Fixes for CVE-2026-9739 (1)

Vendor Advisories for CVE-2026-9739 (1)

IV. Related Vulnerabilities

Same product: MCP Toolbox for Databases
Same vendor: Google
Same weakness: CWE-942

V. Comments for CVE-2026-9739

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