MAL-2026-11546 Malicious code in simple-date-formatter-util-6 (npm)
Malicious package
Published
MAL-2026-11546 is a malicious package: simple-date-formatter-util-6 (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-2026-11546/ (Markdown: https://insights.sbomify.com/MAL-2026-11546/index.md)
- Package
- simple-date-formatter-util-6
- Registry
- npm
What is MAL-2026-11546?
MAL-2026-11546 is a malicious package in simple-date-formatter-util-6, published on 4 Aug 2026.
Official description
Package advertises a trivial formatDate utility but ships a malicious npm postinstall hook. The postinstall script launches a backgrounded interactive bash reverse shell via /dev/tcp/124.221.154.135/4444, granting a remote party shell access on the installer's host at install time. A companion postinstall.js reads the installer's ~/.ssh directory listing along with OS username/platform information and POSTs it over HTTPS to the same hardcoded IP (124.221.154.135:443, path /post). The advertised formatDate export in index.js is a decoy; the package name pattern and empty author metadata are consistent with a typosquat/decoy lure whose sole functional effect is install-time compromise of the installer machine.
What should I do about MAL-2026-11546?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.