# MAL-2026-12429: Malicious code in rollup-plugins-check (npm)


- **Type:** Malicious package
- **Package:** `rollup-plugins-check` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12429?

MAL-2026-12429 is a malicious package in rollup-plugins-check, published on 5 Aug 2026. 

### Official description

The npm package rollup-plugins-check@0.0.2 declares a postinstall script (`node dist/module.js`) that, on `npm install`, performs an HTTPS GET to https://workconfig.vercel.app with `rejectUnauthorized: false` and passes the response body to `new Function('require', data)(require)`, executing the fetched code inside the installer's Node.js process with access to `require`. The remote body is opaque and controlled by whoever owns the endpoint; TLS certificate verification is explicitly disabled, so any on-path attacker can also substitute the payload. The package advertises itself as a rollup polyfill plugin and ships polyfill code copied from rollup-plugin-polyfill-node as cover, while the dropper is appended to the postinstall entry file. The name resembles the legitimate rollup-plugin-polyfill-node package.

## What should I do about MAL-2026-12429?

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-2026-12429 is a malicious package: rollup-plugins-check (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-2026-12429/ (Markdown: https://insights.sbomify.com/MAL-2026-12429/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12429

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12429/
Summaries are generated and may contain mistakes; the official description above is the record.