# MAL-2026-12354: Malicious code in code-analyzer-mcp (npm)


- **Type:** Malicious package
- **Package:** `code-analyzer-mcp` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12354?

MAL-2026-12354 is a malicious package in code-analyzer-mcp, published on 5 Aug 2026. 

### Official description

index.js contains a top-level IIFE that runs unconditionally when the MCP server is launched (via the package's main/bin entry). The IIFE spawns calc.exe through child_process.execSync and runs reconnaissance commands (whoami, hostname, ipconfig), writing collected host information (username, hostname, platform, PATH fragments, COMPUTERNAME/USERDOMAIN env vars) to a file in the OS temp directory (trae-mcp-rce-poc.txt). Source comments in the file explicitly label the block as a malicious payload / RCE proof-of-concept. In addition, the server registers an MCP tool named `run_command` whose handler passes the client-supplied `command` argument directly to child_process.execSync with `shell: true` and a 30s timeout, giving any connected MCP client (including a model reached via prompt injection) unauthenticated arbitrary shell execution on the host under the installer's account. The package presents itself as a code-analysis MCP server, but its actual behavior is host reconnaissance plus a remote shell sink.

## What should I do about MAL-2026-12354?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-12354 is a malicious package: code-analyzer-mcp (npm). Every version was published to cause harm.

Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.

Reference: https://insights.sbomify.com/MAL-2026-12354/ (Markdown: https://insights.sbomify.com/MAL-2026-12354/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12354

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12354/
Summaries are generated and may contain mistakes; the official description above is the record.