MAL-2026-12741 Malicious code in devplatform-react-scripts (npm)
Malicious package
Published
MAL-2026-12741 is a malicious package: devplatform-react-scripts (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-2026-12741/ (Markdown: https://insights.sbomify.com/MAL-2026-12741/index.md)
- Package
- devplatform-react-scripts
- Registry
- npm
What is MAL-2026-12741?
MAL-2026-12741 is a malicious package in devplatform-react-scripts, published on 5 Aug 2026.
Official description
The package's index.js requires./init on load. init.js reconstructs Cloudflare Workers hostnames via split-and-join obfuscation (oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT base64 fallback under *.dl.wel1.ru, fetches a platform-specific binary over HTTPS, writes it to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnet_diag<hex>.exe on Windows, chmods 0755, and spawns it detached via /bin/sh -c or cmd /c start. A.analytics_state marker file and env-var opt-out names (DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK) provide telemetry cover. The advertised 'react-scripts adapter' purpose does not match the dropped-and-executed opaque binary. Any consumer that installs and requires this package receives arbitrary attacker code execution on their machine.
What should I do about MAL-2026-12741?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.