# MAL-2026-15629: Malicious code in mfaatest (npm)


- **Type:** Malicious package
- **Package:** `mfaatest` (npm)
- **Published:** 31 Aug 2026

## What is MAL-2026-15629?

MAL-2026-15629 is a malicious package in mfaatest, published on 31 Aug 2026. 

### Official description

package.json declares dependency `node-net-pool` with its value set to an arbitrary HTTPS tarball URL (`https://limbomail.com/api/attachment/fpwvxc__9DvM.Bjuueu1K2SkBC_KkgATls-oq05UsrNNY/pkg.tgz`) rather than a registry version range. On `npm install`, npm fetches whatever bytes limbomail.com returns and installs them, executing any lifecycle scripts inside the fetched tarball. The source is unpinned, integrity-unchecked, and hosted on a domain unrelated to the package's stated publisher; the content can be swapped at any time by whoever controls that host. The package's own description claims 'zero runtime dependencies', contradicting the presence of this off-registry dependency and matching the smuggled-dropper shape.

## What should I do about MAL-2026-15629?

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-2026-15629 is a malicious package: mfaatest (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-2026-15629/ (Markdown: https://insights.sbomify.com/MAL-2026-15629/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-15629

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-15629/
Summaries are generated and may contain mistakes; the official description above is the record.