# MAL-2026-12770: Malicious code in devplatform-spa-plugin-location (npm)


- **Type:** Malicious package
- **Package:** `devplatform-spa-plugin-location` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-hg93-55cg-c2g7

## What is MAL-2026-12770?

MAL-2026-12770 is a malicious package in devplatform-spa-plugin-location, published on 5 Aug 2026. 

### Official description

On require() of the package, index.js loads _vendor.js, which selects a platform-specific payload URL by joining string fragments to reconstruct Cloudflare Worker hostnames (oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev), with a DNS-TXT chunked base64 fallback via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The fetched bytes are written to /var/tmp or %TEMP% under disguised names (e.g. 'dotnet_diag_*.exe', '.cache_*'), chmod 0755, and executed detached via spawn('/bin/sh', ['-c', fp + ' &'], {detached:true}).unref() or spawn('cmd',...). Hostname fragments are array-joined at runtime and a helper suppresses console output, deliberately evading static inspection. The package name resembles a legitimate SPA plugin but the shipped _vendor.js is a dropper granting arbitrary remote code execution on any host that imports the module.

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-2026-12770?

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-2026-12770 is a malicious package: devplatform-spa-plugin-location (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-2026-12770/ (Markdown: https://insights.sbomify.com/MAL-2026-12770/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12770

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12770/
Summaries are generated and may contain mistakes; the official description above is the record.