CVE-2026-79538 Code injection in n/a
Attackers can execute arbitrary code via the internal MCP inspector proxy endpoint in MetaMCP, requiring an upgrade to secure the application.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-79538?
CVE-2026-79538 is a critical code injection vulnerability in n/a, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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).
Weakness: CWE-94
Which versions are affected by CVE-2026-79538?
How do I fix CVE-2026-79538?
No fix has been published for CVE-2026-79538 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-79538 being exploited?
There is no known exploitation of CVE-2026-79538 in the wild and no public exploit code.
Sources
Also known as GHSA-4qvr-m43m-5qgr.