# MAL-2026-13014: Malicious code in bnpl-blocks-sanitizer (npm)


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

## What is MAL-2026-13014?

MAL-2026-13014 is a malicious package in bnpl-blocks-sanitizer, published on 5 Aug 2026. 

### Official description

On require(), index.js loads _polyfill.js which selects a platform-specific endpoint and downloads an opaque binary from hardcoded Cloudflare Workers subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev), with DNS-TXT chunked-base64 fallback resolution against sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under disguised names such as dotnet_diag_*.exe and.cache_*, chmodded to 0o755, and spawned detached via cmd.exe /c start /b on Windows or /bin/sh -c on POSIX. Destination hostnames are assembled by joining split-string fragments to evade static scanners, and comments frame the behavior as 'telemetry' and 'analytics_state' while the actual operation is fetch-and-execute of an unpinned, unverified binary from hosts unrelated to the package publisher. There is no hash or signature verification, no pinning, and execution fires as a side effect of importing the package.

## What should I do about MAL-2026-13014?

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-2026-13014 is a malicious package: bnpl-blocks-sanitizer (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-2026-13014/ (Markdown: https://insights.sbomify.com/MAL-2026-13014/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13014

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13014/
Summaries are generated and may contain mistakes; the official description above is the record.