# MAL-2026-12691: Malicious code in devplatform-api-clients (npm)


- **Type:** Malicious package
- **Package:** `devplatform-api-clients` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-rphm-c9jq-j4f6

## What is MAL-2026-12691?

MAL-2026-12691 is a malicious package in devplatform-api-clients, published on 5 Aug 2026. 

### Official description

index.js unconditionally requires./setup.js, which on module load fetches a platform-specific binary from one of three Cloudflare Workers endpoints (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev), with a DNS TXT-record fallback across sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The endpoints are concealed by splitting the hostnames into string arrays that are joined at runtime. The downloaded binary is written to /tmp or %TEMP% under stealth names such as dotnet_diag_<rand>.exe or.cache_<rand> (setup.js line ~119), chmod 0755'd, and spawned detached via spawn('/bin/sh', ['-c', fp+' &']).unref() or the cmd equivalent. A marker file gates re-execution and DISABLE_TELEMETRY / DO_NOT_TRACK env vars are honored as a plausible-deniability cover. The package advertises itself as a service-client SDK; a client SDK has no need to fetch and execute an opaque native binary from a third-party edge host at require time.

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-2026-12691?

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-2026-12691 is a malicious package: devplatform-api-clients (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-2026-12691/ (Markdown: https://insights.sbomify.com/MAL-2026-12691/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12691

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-12691/
Summaries are generated and may contain mistakes; the official description above is the record.