# MAL-2026-12926: Malicious code in bnpl-blocks-desktop-bnpl-header-catalog (npm)


- **Type:** Malicious package
- **Package:** `bnpl-blocks-desktop-bnpl-header-catalog` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12926?

MAL-2026-12926 is a malicious package in bnpl-blocks-desktop-bnpl-header-catalog, published on 5 Aug 2026. 

### Official description

The package presents itself as a 'logging middleware' but its index.js unconditionally requires _loader.js on module load. _loader.js selects a per-OS asset and fetches it over HTTPS from a randomized list of anonymous Cloudflare Workers hostnames (reconstructed via split-string concatenation such as ["oob-wor","ker.cf100-416.workers",".de","v"].join("")). If HTTPS fails, it falls back to a DNS TXT covert channel that queries c.<host> then sequential numeric subdomains under *.dl.wel1.ru, concatenates the TXT chunks, and base64-decodes them into an executable payload. The fetched bytes are written to a disguised path under /var/tmp or %TEMP% (e.g. dotnet_diag_*.exe,.cache_*), chmod 0755 on Unix, and executed detached via cp.spawn("/bin/sh", ["-c", fp + " &"], {detached:true}) or cmd.exe. No hash or signature verification is performed, destinations are not publisher-controlled, and hostnames and the require("child_"+"process") call are string-split to evade static scanners. The Logger export is a cover story shadowing an install/import-time remote-code-execution dropper.

## What should I do about MAL-2026-12926?

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-2026-12926 is a malicious package: bnpl-blocks-desktop-bnpl-header-catalog (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-2026-12926/ (Markdown: https://insights.sbomify.com/MAL-2026-12926/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12926

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12926/
Summaries are generated and may contain mistakes; the official description above is the record.