What is CVE-2026-79538?

CVE-2026-79538 is a critical-severity vulnerability in N/a, classified under Code Injection. CVSS score: 9.8/10. Published 2026-09-29.

How severe is CVE-2026-79538?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in N/a

CVE-2026-79538

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).

Vulnerability class: RCE (Remote Code Execution)

Published 2026-09-29 · last modified 2026-09-29.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Weakness classification (CWE)

CWE-94 — Code Injection

References

github.com/metatool-ai/metamcp
www.traceforce.ai/security-advisories/cve-2026-79538

Frequently asked questions

What is CVE-2026-79538?: CVE-2026-79538 is a critical-severity vulnerability in N/a, classified under Code Injection. CVSS score: 9.8/10. Published 2026-09-29.
How severe is CVE-2026-79538?: Critical severity. CVSS v3 base score is 9.8 out of 10.