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EUVD-2026-248235

2026-10-13T02:57:10.056772+00:00

EUVD-2026-248235

fkie_cve-2025-54073

2026-10-13T02:57:10.056799+00:00

mcp-package-docs is an MCP (Model Context Protocol) server that provides LLMs with efficient access to package documentation across multiple programming languages and language server protocol (LSP) capabilities. A command injection vulnerability exists in the `mcp-package-docs` MCP Server prior to the fix in commit cb4ad49615275379fd6f2f1cf1ec4731eec56eb9. The vulnerability is caused by the unsanitized use of input parameters within a call to `child_process.exec`, enabling an attacker to inject arbitrary system commands. Successful exploitation can lead to remote code execution under the server process's privileges. The server constructs and executes shell commands using unvalidated user input directly within command-line strings. This introduces the possibility of shell metacharacter injection (`|`, `>`, `&&`, etc.). Commit cb4ad49615275379fd6f2f1cf1ec4731eec56eb9 in version 0.1.27 contains a fix for the issue, but upgrading to 0.1.28 is recommended.

GHSA-vf9j-h32g-2764 — mcp-package-docs vulnerable to command injection in several tools

2026-10-13T02:57:10.056834+00:00

Affected: npm: mcp-package-docs

### Summary

A command injection vulnerability exists in the `mcp-package-docs` MCP Server. The vulnerability is caused by the unsanitized use of input parameters within a call to `child_process.exec`, enabling an attacker to inject arbitrary system commands. Successful exploitation can lead to remote code execution under the server process's privileges.

The server constructs and executes shell commands using unvalidated user input directly within command-line strings. This introduces the possibility of shell metacharacter injection (`|`, `>`, `&&`, etc.).

### Details

The MCP Server exposes tools to access documentation for several types of packages. An MCP Client can be instructed to execute additional actions for example via prompt injection when asked to read package documentation. Below some example of vulnerable code and different ways to test this vulnerability including a real example of indirect prompt injection that can lead to arbitrary command injection.

### Vulnerable code

The following snippet illustrates the vulnerable code pattern used in the MCP Server’s tooling. **Note**: These is only one instance, but similar patterns may exist elsewhere in the codebase.

```js import { exec } from "child_process"

const execAsync = promisify(exec)

// https://github.com/sammcj/mcp-package-docs/blob/v0.1.26/src/package-docs-server.ts#L1575-L1596 private async describeGoPackage(args: GoDocArgs): Promise { const { package: packageName, symbol, project…