Summaryinfo

A vulnerability identified as critical has been detected in labring FastGPT. The impacted element is the function isInternalAddress of the file /api/core/app/mcpTools/getTools. Performing a manipulation results in server-side request forgery. This vulnerability is known as CVE-2026-34163. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in labring FastGPT. This affects the function isInternalAddress of the file /api/core/app/mcpTools/getTools. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

FastGPT is an AI Agent building platform. Prior to version 4.14.9.5, FastGPT's MCP (Model Context Protocol) tools endpoints (/api/core/app/mcpTools/getTools and /api/core/app/mcpTools/runTool) accept a user-supplied URL parameter and make server-side HTTP requests to it without validating whether the URL points to an internal/private network address. Although the application has a dedicated isInternalAddress() function for SSRF protection (used in other endpoints like the HTTP workflow node), the MCP tools endpoints do not call this function. An authenticated attacker can use these endpoints to scan internal networks, access cloud metadata services, and interact with internal services such as MongoDB and Redis. This issue has been patched in version 4.14.9.5.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-34163 since 03/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available.

Upgrading to version 4.14.9.5 eliminates this vulnerability.

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Productinfo

Vendor

• labring

Name

• FastGPT

Version

• 4.9.0
• 4.9.11
• 4.9.12
• 4.11.1
• 4.14.5-fi
• 4.14.7

Website

• Product: https://github.com/labring/FastGPT/

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