# MAL-2026-13274: Malicious code in devplatform-vite-plugin-preserve-css-modules (npm)


- **Type:** Malicious package
- **Package:** `devplatform-vite-plugin-preserve-css-modules` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-13274?

MAL-2026-13274 is a malicious package in devplatform-vite-plugin-preserve-css-modules, published on 5 Aug 2026. 

### Official description

On require() of the package, index.js loads _loader.js which selects a platform-specific endpoint, downloads a native binary over HTTPS from string-split-obfuscated hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS TXT covert-channel fallback to sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, writes it to /var/tmp or %TEMP% under a disguised name (.cache_<rnd> on Unix, dotnet_diag_<rnd>.exe on Windows), chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. Execution is gated by a /tmp/.analytics_state TTL marker. Destination hostnames are assembled at runtime from split-string fragments to evade source-level review. The package name mimics an internal-sounding vite plugin but the shipped code fetches and executes an arbitrary native binary on the installer's machine at first require().

## What should I do about MAL-2026-13274?

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-2026-13274 is a malicious package: devplatform-vite-plugin-preserve-css-modules (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-2026-13274/ (Markdown: https://insights.sbomify.com/MAL-2026-13274/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13274

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13274/
Summaries are generated and may contain mistakes; the official description above is the record.