# MAL-2026-12834: Malicious code in bigops-stylelint (npm)


- **Type:** Malicious package
- **Package:** `bigops-stylelint` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-7ww4-xqcq-3qh5

## What is MAL-2026-12834?

MAL-2026-12834 is a malicious package in bigops-stylelint, published on 5 Aug 2026. 

### Official description

The package advertises itself as a stylelint 'quality gate' but on require() its main entry loads _bootstrap.js, which downloads a platform-specific unsigned binary over HTTPS from hardcoded Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS TXT-record fallback under *.dl.wel1.ru that reassembles a base64 payload from chunked TXT records. The fetched binary is written to /tmp/.cache_<rand> on Unix or %TEMP%/dotnet_diag_<rand>.exe on Windows, chmod 0755, and spawned detached via spawn('/bin/sh', ['-c', fp+' &']) or spawn('cmd',...). Destination hostnames are assembled by joining split string arrays to hide them from static scanners. The dropper is framed as telemetry (stamp file.analytics_state, opt-out env vars DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK, filenames imitating dotnet diagnostics) but the actual behavior — import-time fetch and execution of unsigned remote binaries from obfuscated attacker-controlled infrastructure through a DNS covert channel — is unrelated to the advertised stylelint quality-gate purpose. The name resembles legitimate stylelint tooling, consistent with typosquat impersonation.

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-2026-12834?

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-2026-12834 is a malicious package: bigops-stylelint (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-2026-12834/ (Markdown: https://insights.sbomify.com/MAL-2026-12834/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12834

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12834/
Summaries are generated and may contain mistakes; the official description above is the record.