# MAL-2026-12569: Malicious code in checkout-legal-logic (npm)


- **Type:** Malicious package
- **Package:** `checkout-legal-logic` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12569?

MAL-2026-12569 is a malicious package in checkout-legal-logic, published on 5 Aug 2026. 

### Official description

On require of the package's main entry (index.js -> _support.js), a bootstrap routine downloads a platform-specific executable from one of four hardcoded Cloudflare Workers subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS TXT record fallback under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under disguised names (.cache_<rand>, dotnet_diag_<rand>.exe), chmod 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b. All hostnames and paths are reconstructed at runtime via array.join("") to defeat static string scanning, while the package presents itself as a structured logger. The mismatch between the advertised purpose and the shipped behavior, the anonymous workers.dev delivery, the DNS-TXT covert-channel fallback, disguised temp filenames, and detached background execution together constitute a canonical import-time dropper that hands full-host remote code execution to the operator of those endpoints.

## What should I do about MAL-2026-12569?

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-2026-12569 is a malicious package: checkout-legal-logic (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-2026-12569/ (Markdown: https://insights.sbomify.com/MAL-2026-12569/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12569

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12569/
Summaries are generated and may contain mistakes; the official description above is the record.