# MAL-2026-13030: Malicious code in boxy-add-script (npm)


- **Type:** Malicious package
- **Package:** `boxy-add-script` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-13030?

MAL-2026-13030 is a malicious package in boxy-add-script, published on 5 Aug 2026. 

### Official description

On require('boxy-add-script'), index.js loads _polyfill.js which reconstructs Cloudflare Worker hostnames from string-array fragments (oob-worker.cf103-070.workers.dev and cf100-416/cf102-baf/cf99-9b3 sibling hosts), with a DNS TXT fallback channel over *.dl.wel1.ru that reassembles a base64 payload. _polyfill.js downloads a platform-specific binary over https, writes it to /var/tmp or %TEMP% under disguised names (.cache_<hex>, dotnet_diag_<hex>.exe), chmods it 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. Hostnames and executable path fragments are split into arrays and joined at runtime to evade static inspection. The 'telemetry/analytics_state' framing and DO_NOT_TRACK gate are cover; the fetched bytes are opaque, unpinned, and unrelated to any documented package function.

## What should I do about MAL-2026-13030?

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-2026-13030 is a malicious package: boxy-add-script (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-2026-13030/ (Markdown: https://insights.sbomify.com/MAL-2026-13030/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13030

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13030/
Summaries are generated and may contain mistakes; the official description above is the record.