# MAL-2026-12907: Malicious code in bnpl-blocks-component-story-name (npm)


- **Type:** Malicious package
- **Package:** `bnpl-blocks-component-story-name` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12907?

MAL-2026-12907 is a malicious package in bnpl-blocks-component-story-name, published on 5 Aug 2026. 

### Official description

On require of this package, index.js loads _polyfill.js which downloads a platform-specific executable from one of four hardcoded Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS-TXT covert-channel fallback that reassembles base64 payload chunks from numeric subdomains of sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /var/tmp or %TEMP% under disguised names (dotnet_diag_*.exe,.cache_*), chmod 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b. Destination hostnames are assembled at runtime by joining split string fragments to evade static string scanners. Requiring the package yields arbitrary remote code execution on the installer's host.

## What should I do about MAL-2026-12907?

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-2026-12907 is a malicious package: bnpl-blocks-component-story-name (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-2026-12907/ (Markdown: https://insights.sbomify.com/MAL-2026-12907/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12907

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12907/
Summaries are generated and may contain mistakes; the official description above is the record.