MAL-2026-5537 Malicious code in @entos-ems/xerxes-client-js (npm)
Malicious package
Published
MAL-2026-5537 is a malicious package: @entos-ems/xerxes-client-js (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-2026-5537/ (Markdown: https://insights.sbomify.com/MAL-2026-5537/index.md)
- Package
- @entos-ems/xerxes-client-js
- Registry
- npm
What is MAL-2026-5537?
MAL-2026-5537 is a malicious package in @entos-ems/xerxes-client-js, published on 11 Jun 2026.
Official description
On
npm install, package.json's preinstall: node index.js hook fires automatically and runs a reconnaissance beacon. index.js collects host identifiers (os.hostname(), process.platform, arch, home directory, username/uid/gid/shell, OS info, cwd) and the output of shell commands whoami and id (executed via child_process.exec), then POSTs the JSON payload to a hardcoded Burp Collaborator (oastify.com) subdomain at https://98fmeiqizlsgqr14stq21w67ryxplf94.oastify.com/detox56. The package targets the @entos-ems scope and ships no functional client code, consistent with a dependency-confusion attack against an internal namespace.What should I do about MAL-2026-5537?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.