MAL-2026-12492 Malicious code in uploader-frontend-legacy (npm)
Malicious package
Published
MAL-2026-12492 is a malicious package: uploader-frontend-legacy (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-2026-12492/ (Markdown: https://insights.sbomify.com/MAL-2026-12492/index.md)
- Package
- uploader-frontend-legacy
- Registry
- npm
What is MAL-2026-12492?
MAL-2026-12492 is a malicious package in uploader-frontend-legacy, published on 5 Aug 2026.
Official description
The package's
scripts.install runs node index.js, which loads lib/core.js and issues a dns.resolve4 query against a subdomain of oob.sl4x0.xyz constructed from os.userInfo().username, os.hostname(), and process.cwd(), along with a package tag and timestamp. Module names (os, dns, process), API names (userInfo, hostname, cwd, resolve4), and the destination domain oob.sl4x0.xyz are assembled from String.fromCharCode byte arrays in lib/b02e30.js, lib/6ad264.js, and lib/core.js to hide the behavior from casual review. The net effect on npm install is an outbound DNS beacon carrying installer-identifying data to an author-controlled out-of-band listener.What should I do about MAL-2026-12492?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.