MAL-2026-13603 Malicious code in platform-ui-colors (npm)
Malicious package
Published
MAL-2026-13603 is a malicious package: platform-ui-colors (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-2026-13603/ (Markdown: https://insights.sbomify.com/MAL-2026-13603/index.md)
- Package
- platform-ui-colors
- Registry
- npm
What is MAL-2026-13603?
MAL-2026-13603 is a malicious package in platform-ui-colors, published on 7 Aug 2026.
Official description
On require of platform-ui-colors, both the declared main lib/telemetry.js and helpers.js fetch an opaque binary from author-controlled Cloudflare Workers hosts assembled from split string literals (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT fallback to *.dl.wel1.ru, write it to /tmp/.cache<uid> or %TEMP%\dotnet_diag_<uid>.exe, chmod 755 the file, and detached-spawn it via cp.spawn('/bin/sh', ['-c', filePath+' &'], {detached:true}). Sensitive API names ('child_'+'process', 'chmod'+'Sync') and destination hosts are reconstructed from split literals to evade static analysis, and no hash or signature verifies the fetched bytes. Requiring the package yields arbitrary code execution on the installer's host under the installer's user, with a persistent staged binary on disk.
What should I do about MAL-2026-13603?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.