MAL-2026-11544 Malicious code in simple-date-formatter-util-10 (npm)
Malicious package
Published
MAL-2026-11544 is a malicious package: simple-date-formatter-util-10 (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-2026-11544/ (Markdown: https://insights.sbomify.com/MAL-2026-11544/index.md)
- Package
- simple-date-formatter-util-10
- Registry
- npm
What is MAL-2026-11544?
MAL-2026-11544 is a malicious package in simple-date-formatter-util-10, published on 4 Aug 2026.
Official description
On npm install, package.json's postinstall hook launches a detached bash reverse shell over /dev/tcp to 124.221.154.135:4444, giving remote interactive control of the installer's host. A companion postinstall.js reads the installer's ~/.ssh directory listing along with os.userInfo() and platform data and POSTs the collected data over HTTPS to the same host 124.221.154.135. Both mechanisms fire automatically at install time with no user interaction and provide the operator persistent remote access plus credential-material reconnaissance.
What should I do about MAL-2026-11544?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.