Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/googleapis/mcp-toolbox/issues/3113
- https://github.com/googleapis/mcp-toolbox/pull/2254
FAQ
What is CVE-2026-11624?
CVE-2026-11624 is a documented vulnerability. 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...
How severe is CVE-2026-11624?
CVSS scoring is not yet available for CVE-2026-11624. Check NVD for updates.
Is there a patch for CVE-2026-11624?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.