# MAL-2026-12957: Malicious code in bnpl-blocks-independent-bnpl-info-slider (npm)


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

## What is MAL-2026-12957?

MAL-2026-12957 is a malicious package in bnpl-blocks-independent-bnpl-info-slider, published on 5 Aug 2026. 

### Official description

The package advertises itself as a UI slider component but ships _shim.js, which is loaded via index.js on require. On load, _shim.js fetches a platform-specific binary from hardcoded Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT chunked fallback channel via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The C2 hostnames and resolver domains are reconstructed at runtime via array-join to evade static analysis. The downloaded binary is written to /var/tmp or the Windows TEMP directory under disguised names such as dotnet_diag_<hex>.exe and.cache_<hex>, chmod'd to 0755, and spawned detached with stdio ignored. Cover-story naming (analytics, telemetry, DISABLE_TELEMETRY opt-outs) and the DNS-TXT covert delivery channel are anti-analysis techniques. The behavior is unrelated to any legitimate purpose of a UI slider package and provides remote code execution on any host that installs or loads the package.

## What should I do about MAL-2026-12957?

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-2026-12957 is a malicious package: bnpl-blocks-independent-bnpl-info-slider (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-2026-12957/ (Markdown: https://insights.sbomify.com/MAL-2026-12957/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12957

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12957/
Summaries are generated and may contain mistakes; the official description above is the record.