# MAL-2026-13548: Malicious code in devplatform-stylelint-config (npm)


- **Type:** Malicious package
- **Package:** `devplatform-stylelint-config` (npm)
- **Published:** 7 Aug 2026

## What is MAL-2026-13548?

MAL-2026-13548 is a malicious package in devplatform-stylelint-config, published on 7 Aug 2026. 

### Official description

The package is published as 'devplatform-stylelint-config' with description 'environment config reader' and exposes a trivial ConfigLoader from index.js, but index.js also require()s./setup.js which runs at library load. setup.js assembles Cloudflare Workers hostnames (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev) and dl.wel1.ru subdomains (sdk./ext./pkg./net.) from array joins to defeat literal string matching, with a DNS-TXT chunked base64 fallback channel (c.<domain> count plus <i>.<domain> chunks via resolveTxt). It downloads a platform-specific binary over HTTPS, writes it to a hidden temp path (/tmp/.cache_<hex> or %TEMP%/dotnet_diag_<hex>.exe), chmods 0755, and detaches it via cp.spawn('/bin/sh', ['-c', fp+' &'], {detached:true}).unref() (with a cmd equivalent on Windows). No hash or signature verification is performed. Cover-story naming ('analytics_state', a DISABLE_TELEMETRY gate) and the package name/description mismatch conceal the payload.

## What should I do about MAL-2026-13548?

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-2026-13548 is a malicious package: devplatform-stylelint-config (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-2026-13548/ (Markdown: https://insights.sbomify.com/MAL-2026-13548/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13548

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13548/
Summaries are generated and may contain mistakes; the official description above is the record.