CVE-2026-79538 Details
Description
metatool-ai MetaMCP up to and including 2.4.22 is vulnerable to Code Execution in the internal MCP inspector proxy endpoint GET /mcp-proxy/server/stdio (createTransport, STDIO branch, routers/mcp-proxy/server.ts).
A code execution vulnerability has been identified in metatool-ai MetaMCP versions through 2.4.22. The issue arises in the internal MCP inspector proxy endpoint GET /mcp-proxy/server/stdio, specifically within the createTransport function's STDIO branch. This vulnerability allows authenticated users to execute commands in the application container.
As of September 22, 2026, no patched release has been identified. Until a patch is available, it is advised to restrict public access to the inspector proxy routes, disable open self-registration, and rotate any secrets that were in the environment of an exposed deployment.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 29, 2026CISA-ADP
Assessed Sep 29, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/metatool-ai/metamcp | [email protected] | Source CodeVendor |
| https://www.traceforce.ai/security-advisories/cve-2026-79538 | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-94 | Improper Control of Generation of Code ('Code Injection') | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| metatool-ai MetaMCP | <v2.4.22, >= v2.4.22 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 29, 2026 | CVE Modified | CISA-ADP |
| Sep 29, 2026 | New CVE Received | [email protected] |