# MAL-2026-12168: Malicious code in bigops-frontend-bigops-frontend-core (npm)


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

## What is MAL-2026-12168?

MAL-2026-12168 is a malicious package in bigops-frontend-bigops-frontend-core, published on 5 Aug 2026. 

### Official description

On require() of the package, _vendor.js downloads a platform-selected native binary from hardcoded Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT chunked-base64 fallback via subdomains of dl.wel1.ru, writes it to a temp path under a decoy filename (dotnet_diag_*.exe on Windows,.cache_* on Unix), chmods 0755, and spawns it detached via cmd.exe or /bin/sh. Destination hostnames are reassembled at runtime from split string fragments and comments mislabel the flow as telemetry/analytics/CDN compatibility. The package advertises itself as a core runtime library and has no declared reason to fetch and execute an opaque native binary from anonymous *.workers.dev hosts on import.

## What should I do about MAL-2026-12168?

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-2026-12168 is a malicious package: bigops-frontend-bigops-frontend-core (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-2026-12168/ (Markdown: https://insights.sbomify.com/MAL-2026-12168/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12168

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12168/
Summaries are generated and may contain mistakes; the official description above is the record.