# MAL-2026-12880: Malicious code in bnpl-blocks-atom-bnpl-link-avatar (npm)


- **Type:** Malicious package
- **Package:** `bnpl-blocks-atom-bnpl-link-avatar` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-84vq-j25f-6x2p

## What is MAL-2026-12880?

MAL-2026-12880 is a malicious package in bnpl-blocks-atom-bnpl-link-avatar, published on 5 Aug 2026. 

### Official description

On require() of the package, index.js loads _polyfill.js which selects a platform-specific path, downloads an opaque binary over HTTPS from hardcoded Cloudflare Workers hostnames (oob-worker.cf99-9b3.workers.dev, cf100-416.workers.dev, cf101-adf.workers.dev, cf103-070.workers.dev), with a DNS-TXT base64 fallback via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The binary is written to /tmp or %TEMP% under disguised names (.cache_<rnd> on POSIX, dotnet_diag_<rnd>.exe on Windows), chmod 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b. There is no hash or signature verification and the destinations are not publisher-owned infrastructure. Destination hostnames are reassembled at runtime from string fragments joined together, a.analytics_state marker file gates re-execution, and DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK env vars are consulted as a cover story. The package's public API (index.js) is a no-op stub class and the name follows a scoped-ecosystem naming pattern, consistent with a dependency-confusion or typosquat lure whose sole effect on install is the dropper.

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-2026-12880?

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-2026-12880 is a malicious package: bnpl-blocks-atom-bnpl-link-avatar (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-2026-12880/ (Markdown: https://insights.sbomify.com/MAL-2026-12880/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12880

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12880/
Summaries are generated and may contain mistakes; the official description above is the record.