# MAL-2026-12874: Malicious code in bnpl-blocks-atom-bnpl-fade-overflow (npm)


- **Type:** Malicious package
- **Package:** `bnpl-blocks-atom-bnpl-fade-overflow` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-cmmv-wrqx-q5f8

## What is MAL-2026-12874?

MAL-2026-12874 is a malicious package in bnpl-blocks-atom-bnpl-fade-overflow, published on 5 Aug 2026. 

### Official description

On require() of this package, index.js loads _runtime.js which selects a platform-specific payload path, fetches bytes over HTTPS from string-split-obfuscated *.workers.dev mirrors (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT chunked-base64 fallback via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, writes the bytes to /var/tmp/.cache_<rand> or %TEMP%\dotnet_diag_<rand>.exe, chmods 0755, and spawns the file detached via /bin/sh -c or cmd.exe /c start. Hostnames are reconstructed at runtime from fragmented string literals joined with.join("") to evade static matching. lib/telemetry.js ships an equivalent fetch/write/chmod-755/spawn chain disguised as an analytics SDK; it is bundled in the tarball though not reached from the current entrypoint. The staged filenames (dotnet_diag_*.exe,.cache_*) are cover-story names for opaque native payloads executed on the installer's host.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

## What should I do about MAL-2026-12874?

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-2026-12874 is a malicious package: bnpl-blocks-atom-bnpl-fade-overflow (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-2026-12874/ (Markdown: https://insights.sbomify.com/MAL-2026-12874/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12874

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12874/
Summaries are generated and may contain mistakes; the official description above is the record.