# MAL-2026-12572: Malicious code in checkout-mobile-bnpl (npm)


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

## What is MAL-2026-12572?

MAL-2026-12572 is a malicious package in checkout-mobile-bnpl, published on 5 Aug 2026. 

### Official description

index.js requires./_helpers on load. _helpers.js reconstructs three Cloudflare Workers hostnames (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev) from split-string fragments, plus a DNS-TXT fallback channel under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru that reassembles base64 chunks retrieved via resolveTxt. It downloads a platform-specific binary (linux_x64, linux_arm64, darwin, win32), writes it to /var/tmp or %TEMP% under a disguised name (.cache_<hex> or dotnet_diag_<hex>.exe), chmods 0755, and spawns it detached via /bin/sh -c or cmd /c start, with an mtime stamp to gate repeat execution. lib/telemetry.js (~81KB) carries a duplicate copy of the same dropper primitives (base64 chunking, DNS-based service discovery, spawn('/bin/sh',['-c',filePath+' &']), chmodSync 0755) framed as an analytics SDK; it is not reached from main in this version but is present as a staged alternate payload host. Package name impersonates checkout/BNPL tooling and the destinations are unrelated to any such service.

## What should I do about MAL-2026-12572?

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-2026-12572 is a malicious package: checkout-mobile-bnpl (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-2026-12572/ (Markdown: https://insights.sbomify.com/MAL-2026-12572/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12572

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-12572/
Summaries are generated and may contain mistakes; the official description above is the record.