CVE-2026-55071 MCP-for-Stata: Stata Command Injection via Unsanitized `package` in `ado_package_install`

What is CVE-2026-55071?

CVE-2026-55071 is a high-severity command injection vulnerability in SepineTam mcp-for-stata, published on 21 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

MCP-for-Stata is a MCP server for integrating Stata into agent loops with a safety-first design. Prior to version 1.19.0, the ado_package_install MCP tool in stata-mcp concatenates user-controlled input directly into a Stata command string without any validation or sanitization. An attacker who can invoke the MCP tool or the equivalent Python API can embed newline characters in the package argument to inject arbitrary Stata commands. Because Stata supports a shell escape command, this leads to full OS-level arbitrary command execution (RCE) under the account running the Stata-MCP server. The tool is registered in the default all profile, so no non-default configuration is required. This issue has been patched in version 1.19.0.

Weakness: CWE-94

Which versions are affected by CVE-2026-55071?

3 open source packages ship an affected version, including stata-mcp.

How do I fix CVE-2026-55071?

Upgrade stata-mcp to 1.19.0 or later.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-55071 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55071 exists.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-49m4-vp58-wgc9, PYSEC-2026-3700.