# MAL-2026-12976: Malicious code in bnpl-blocks-markdown (npm)


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

## What is MAL-2026-12976?

MAL-2026-12976 is a malicious package in bnpl-blocks-markdown, published on 5 Aug 2026. 

### Official description

On require('bnpl-blocks-markdown'), index.js loads _bootstrap.js which downloads a platform-specific binary from runtime-assembled Cloudflare Workers hosts (strings such as ['oob-worker.cf100-416.workers','.d','ev'].join('') and ['sdk.dl.','wel','1.r','u'].join('')), with a base64-over-DNS-TXT fallback channel via wel1.ru subdomains. The fetched bytes are written to /tmp or %TEMP% under disguised filenames mimicking system tools (e.g..cache_<hex>, dotnet_diag_<hex>.exe), chmod 0755'd, and spawned detached via /bin/sh -c or cmd. Env-var names DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK and filenames like analytics_state are cover-story framing; the package's advertised purpose is a markdown utility, which has no need to fetch and execute an arch-specific native binary from obfuscated hosts at import time. This is a classic import-time dropper with attacker-controlled code execution on the installer's host.

## What should I do about MAL-2026-12976?

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-2026-12976 is a malicious package: bnpl-blocks-markdown (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-2026-12976/ (Markdown: https://insights.sbomify.com/MAL-2026-12976/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12976

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12976/
Summaries are generated and may contain mistakes; the official description above is the record.