# MAL-2026-11479: Malicious code in rollup-plugin-polyfill-hold (npm)


- **Type:** Malicious package
- **Package:** `rollup-plugin-polyfill-hold` (npm)
- **Published:** 31 Jul 2026
- **Also known as:** GHSA-7p2c-jxw4-jxvv

## What is MAL-2026-11479?

MAL-2026-11479 is a malicious package in rollup-plugin-polyfill-hold, published on 31 Jul 2026. 

### Official description

The package presents itself as a rollup plugin / CDN icon-asset fetcher but its exported getPlugin, setPlugin, and getPluginExten functions issue HTTPS requests to a hardcoded endpoint at rest-icon-handler.store/icons/103 and /icons/389 and pass the JSON-parsed response body to eval(), giving the endpoint owner arbitrary JavaScript execution in the caller's Node process. The destination URL is assembled from split constants (protocol/separator/subdomain/domain/path) rather than appearing as a single string, while a decoy setDefaultModule references legitimate CDN providers (cloudflare/fastly/akamai) that are never contacted by the eval path. getPlugin additionally schedules getPluginExten via setTimeout so the fetch-and-eval recurs. The eval-of-remote-content behavior is not disclosed by the package's advertised purpose and the endpoint is unrelated to any documented CDN.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

## What should I do about MAL-2026-11479?

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-2026-11479 is a malicious package: rollup-plugin-polyfill-hold (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-2026-11479/ (Markdown: https://insights.sbomify.com/MAL-2026-11479/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-11479

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-11479/
Summaries are generated and may contain mistakes; the official description above is the record.