CVE-2026-79538CWE-94code-injection

CVE-2026-79538

Critical · published September 30, 2026

CVSS v3.1
9.8
EPSS
0%
Percentile
36.8
In the wild
Unconfirmed
What it is

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).

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00435 · 36.8th percentile
Weakness
CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-09-30T00:17Z
References (2)
https://github.com/metatool-ai/metamcp · [email protected]https://www.traceforce.ai/security-advisories/cve-2026-79538 · [email protected]
EPSS history
Timeline
  • 01 OCT 03:49Z
    EPSS moved — → 0%
    epss
  • 29 SEP 00:00Z
    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…
    cvelistv5