MAL-2026-13990 Malicious code in wct-st (npm)
Malicious package
Published
MAL-2026-13990 is a malicious package: wct-st (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-2026-13990/ (Markdown: https://insights.sbomify.com/MAL-2026-13990/index.md)
- Package
- wct-st
- Registry
- npm
What is MAL-2026-13990?
MAL-2026-13990 is a malicious package in wct-st, published on 13 Aug 2026.
Official description
On
npm install, the package's postinstall lifecycle script collects installer host identifiers (hostname, platform, architecture, Node.js version, package name, npm lifecycle event) and POSTs them as JSON to the hardcoded remote endpoint https://bhvte4h4.instances.poc.jchunt.top/wct-st. The beacon fires automatically with no consent, configuration, or opt-out. The package name resembles the deprecated web-component-tester, consistent with a typosquat / dependency-confusion beacon shape.What should I do about MAL-2026-13990?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.