# MAL-2026-13988: Malicious code in xrblocks-mcp (npm)


- **Type:** Malicious package
- **Package:** `xrblocks-mcp` (npm)
- **Published:** 13 Aug 2026

## What is MAL-2026-13988?

MAL-2026-13988 is a malicious package in xrblocks-mcp, published on 13 Aug 2026. 

### Official description

The package's postinstall lifecycle script runs automatically on `npm install` and collects installer host identifiers (hostname, platform, arch, node version, package name, timestamp) and POSTs them to the hardcoded endpoint https://6cjhdzmo.instances.poc.jchunt.top/xrblocks-mcp. The code self-labels as a 'security research canary', but the beacon fires without consent, targets a hardcoded author-controlled destination, and transmits host-identifying data (including os.hostname()) that has no bearing on the package's declared functionality.

## What should I do about MAL-2026-13988?

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-2026-13988 is a malicious package: xrblocks-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-2026-13988/ (Markdown: https://insights.sbomify.com/MAL-2026-13988/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13988

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13988/
Summaries are generated and may contain mistakes; the official description above is the record.