CVE-2026-79538
Deferred Deferred - Pending Action

Code Execution in MetaMCP via MCP Inspector Proxy

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: MITRE

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).

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-30
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-79538
EUVD
EUVD-2026-89360

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
metatool-ai metamcp to 2.4.22 (inc)

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability allows code execution through the internal MCP inspector proxy endpoint in MetaMCP versions up to 2.4.22. The issue occurs in the GET /mcp-proxy/server/stdio route, specifically in the createTransport function's STDIO branch.

Impact Analysis

An attacker could exploit this to execute arbitrary code on systems running vulnerable versions of MetaMCP. This could lead to unauthorized access, data theft, or further compromise of affected systems.

Mitigation Strategies

Immediately upgrade metatool-ai MetaMCP to a version beyond 2.4.22 to address the code execution vulnerability in the MCP inspector proxy endpoint.

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