MAL-2026-12327 Malicious code in @offa-uwk/offa-uwk (npm)
Malicious package
Published
MAL-2026-12327 is a malicious package: @offa-uwk/offa-uwk (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-2026-12327/ (Markdown: https://insights.sbomify.com/MAL-2026-12327/index.md)
- Package
- @offa-uwk/offa-uwk
- Registry
- npm
What is MAL-2026-12327?
MAL-2026-12327 is a malicious package in @offa-uwk/offa-uwk, published on 5 Aug 2026.
Official description
On
npm install, the package's postinstall script (node index.js) collects host identifiers (os.hostname(), os.userInfo().username, process.cwd()) and POSTs them via HTTPS to a hardcoded webhook.site collector at https://webhook.site/e6b10849-38dc-4280-a8e3-72ab39cfaf65. Immediately after the beacon, the script executes shutdown -h now with a fallback of systemctl poweroff, forcibly powering off the installing host. A preinstall step also writes a marker file to the absolute path /home/OFFA/flag, outside the package directory. Package metadata (name @offa-uwk/offa-uwk, version 999.0.6) is consistent with a proof-of-concept malicious artifact.What should I do about MAL-2026-12327?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.