CVE-2026-11624 MCP Toolbox for Databases has an Origin Validation Error
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-11624?
CVE-2026-11624 is a critical vulnerability in Google MCP Toolbox for Databases, published on 13 Jun 2026.
Official description
The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced alongside the existing "--allowed-origins" flag, enabling users to specify permitted hosts at server startup. Both flags default to "*", allowing users to implement strict access controls as needed without breaking existing setups. If either flag is set to "*", the server will output a startup warning about potential vulnerabilities. Documentation has also been updated to highlight these security considerations.
Weakness: CWE-346
Which versions are affected by CVE-2026-11624?
3 open source packages ship an affected version, including github.com/googleapis/mcp-toolbox and github.com/googleapis/genai-toolbox.
| Package | Affected | Fixed in |
|---|---|---|
github.com/googleapis/mcp-toolbox Go | All versions | 0.25.0 |
github.com/googleapis/mcp-toolbox Go | All versions | 0.25.0 |
github.com/googleapis/genai-toolbox Go | All versions | 0.25.0 |
How do I fix CVE-2026-11624?
Upgrade github.com/googleapis/mcp-toolbox to 0.25.0 or later.
Is CVE-2026-11624 being exploited?
There is no known exploitation of CVE-2026-11624 in the wild and no public exploit code.
Sources
Also known as GHSA-76g7-m3xw-x9gr, GO-2026-6288.