# MAL-2026-13225: Malicious code in bigops-nitro-client (npm)


- **Type:** Malicious package
- **Package:** `bigops-nitro-client` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-13225?

MAL-2026-13225 is a malicious package in bigops-nitro-client, published on 5 Aug 2026. 

### Official description

On require(), index.js loads _vendor.js which downloads a platform-specific native binary from rotating Cloudflare Workers endpoints (oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT chunked base64 fallback channel via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched binary is written to /tmp or %TEMP% under disguised names (dotnet_diag,.cache), chmod 0755, and spawned detached via spawn('/bin/sh', ['-c', <path> + ' &']) or spawn('cmd',...). Host names are assembled at runtime from split string arrays joined with.join('') to evade static host scanning. The package presents itself as a trivial stub client and has no legitimate need for a native binary download or execution.

## What should I do about MAL-2026-13225?

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-2026-13225 is a malicious package: bigops-nitro-client (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-2026-13225/ (Markdown: https://insights.sbomify.com/MAL-2026-13225/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13225

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13225/
Summaries are generated and may contain mistakes; the official description above is the record.