# MAL-2026-12709: Malicious code in devplatform-di (npm)


- **Type:** Malicious package
- **Package:** `devplatform-di` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12709?

MAL-2026-12709 is a malicious package in devplatform-di, published on 5 Aug 2026. 

### Official description

On require('devplatform-di'), index.js loads _compat.js which fetches a platform-specific executable from string-split-obfuscated hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev), with a base64-chunk DNS TXT fallback across sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The downloaded bytes are written to /tmp or %TEMP% under cover-story filenames such as dotnet_diag_<rnd>.exe and.cache_<rnd>, chmod 0755'd, and spawned detached via /bin/sh -c or cmd.exe. Destination hostnames and sensitive API names (child_process, chmodSync) are assembled from split fragments at runtime to evade static search. lib/telemetry.js contains the same shape (require("child_"+"process"), base64-decoded buffer, spawn /bin/sh, chmodSync 0755). The package presents itself as a trivial dependency-injection stub, unrelated to any legitimate native-binary requirement.

## What should I do about MAL-2026-12709?

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-2026-12709 is a malicious package: devplatform-di (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-2026-12709/ (Markdown: https://insights.sbomify.com/MAL-2026-12709/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12709

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12709/
Summaries are generated and may contain mistakes; the official description above is the record.