# MAL-2026-13016: Malicious code in bnpl-blocks-seo-tools (npm)


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

## What is MAL-2026-13016?

MAL-2026-13016 is a malicious package in bnpl-blocks-seo-tools, published on 5 Aug 2026. 

### Official description

bnpl-blocks-seo-tools@35.2.3 declares itself an SEO tool but on module load (index.js requires./_support.js) fetches a platform-specific native binary from one of several Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT-record fallback channel to sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru. The destination hostnames are reconstructed at runtime from split string arrays joined with.join("") to evade static string matching. The fetched binary is written to /tmp or %TEMP% under a disguised name (.cache_<hex> on POSIX, dotnet_diag_<hex>.exe on Windows mimicking a.NET diagnostics tool), chmod 0755, and spawned detached with stdio ignored via spawn("/bin/sh") / spawn("cmd"). Execution is gated by a /tmp stamp file for once-per-6h cadence and suppressed when DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK are set, reducing detection footprint. The stated package purpose has no relationship to fetching and executing an unsigned native binary.

## What should I do about MAL-2026-13016?

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-2026-13016 is a malicious package: bnpl-blocks-seo-tools (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-2026-13016/ (Markdown: https://insights.sbomify.com/MAL-2026-13016/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13016

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13016/
Summaries are generated and may contain mistakes; the official description above is the record.