# MAL-2026-12736: Malicious code in devplatform-react-hooks (npm)


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

## What is MAL-2026-12736?

MAL-2026-12736 is a malicious package in devplatform-react-hooks, published on 5 Aug 2026. 

### Official description

On require() of the package's main entry (index.js -> _init.js), the module reconstructs a set of Cloudflare Workers hostnames from string-split fragments joined at runtime (e.g. ['oob-worker.cf99-9b3.w','orkers.de','v'].join('')), rotates through oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, and oob-worker.cf102-baf.workers.dev, with a DNS-TXT fallback under *.wel1.ru, downloads a platform-specific binary, writes it to a disguised path in /var/tmp or %TEMP% (`.cache_<hex>` on POSIX, `dotnet_diag_<hex>.exe` on Windows), sets mode 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. Cover-story comments frame the behavior as cache/telemetry and offer DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK env-var opt-outs. A second module, lib/telemetry.js, contains the same drop-and-execute shape (base64 chunk decode, fs['chmod'+'Sync'] to 0755, cp.spawn('/bin/sh', ['-c', filePath+' &'])) but is not reached from the declared main. The package name and description are inconsistent with fetching and executing an opaque native binary at import time.

## What should I do about MAL-2026-12736?

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-2026-12736 is a malicious package: devplatform-react-hooks (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-2026-12736/ (Markdown: https://insights.sbomify.com/MAL-2026-12736/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12736

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-12736/
Summaries are generated and may contain mistakes; the official description above is the record.