MAL-2026-6291 Malicious code in @outmarket/ui (npm)
Malicious package
Published
MAL-2026-6291 is a malicious package: @outmarket/ui (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-2026-6291/ (Markdown: https://insights.sbomify.com/MAL-2026-6291/index.md)
- Package
- @outmarket/ui
- Registry
- npm
What is MAL-2026-6291?
MAL-2026-6291 is a malicious package in @outmarket/ui, published on 23 Jun 2026.
Official description
package.json declares a postinstall script that runs automatically on
npm install and performs require('https').get(...) to a Burp Collaborator subdomain (7rzjsf29azci2qjsm6kxt23ag1mtanyc.oastify.com), passing os.hostname() and os.userInfo().username as query parameters. Any developer or build system installing this package leaks host identity to an external attacker-controlled OAST endpoint. The package's own description (PENTEST-PoC: Dependency confusion - SecurifyAI engagement 2026-06-23) and the version 9.9.9 published under the @outmarket scope indicate the package is designed to win resolution against an internal private package of the same name and harvest beacons from anyone in the targeted organization who installs it.What should I do about MAL-2026-6291?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.