# MAL-2026-17663: Malicious code in mfasolver (npm)


- **Type:** Malicious package
- **Package:** `mfasolver` (npm)
- **Published:** 8 Oct 2026

## What is MAL-2026-17663?

MAL-2026-17663 is a malicious package in mfasolver, published on 8 Oct 2026. 

### Official description

package.json at line 41 declares the only runtime dependency `node-net-pool` as `https://github.com/trktgq0wbre1/node-net-pool/archive/refs/heads/main.tar.gz` — an off-registry HTTP source pointing at the mutable `main` branch of a GitHub account unrelated to the mfasolver publisher, with no commit pin and no integrity hash. `npm install mfasolver` fetches whatever bytes that URL returns at install time and runs any lifecycle scripts contained in the fetched archive. The dependency is additionally force-loaded on require: `lib/cache.js` top-level calls `module['require']('node-net-pool')` inside a try/catch, so importing mfasolver also executes the attacker-controllable code. Separately, `index.js` opens TLS connections to discord.com with `rejectUnauthorized: false`, disabling certificate validation on the package's own Discord traffic.

## What should I do about MAL-2026-17663?

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-2026-17663 is a malicious package: mfasolver (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-2026-17663/ (Markdown: https://insights.sbomify.com/MAL-2026-17663/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-17663

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-17663/
Summaries are generated and may contain mistakes; the official description above is the record.