MAL-2026-12203 Malicious code in simple-date-formatter-util-14 (npm)
Malicious package
Published
MAL-2026-12203 is a malicious package: simple-date-formatter-util-14 (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-2026-12203/ (Markdown: https://insights.sbomify.com/MAL-2026-12203/index.md)
- Package
- simple-date-formatter-util-14
- Registry
- npm
What is MAL-2026-12203?
MAL-2026-12203 is a malicious package in simple-date-formatter-util-14, published on 5 Aug 2026.
Official description
package.json declares a postinstall lifecycle script that runs a shell pipeline enumerating /home/work directory contents, probing the internal Kubernetes API server, and reading /proc namespace/mount/capability info, then POSTs the collected output to http://safjhdvsfwzhieemkdzbgr54r0yjhrmok.oast.fun/escinfo3 (an interact.sh OAST collector). The tarball also ships postinstall.js, which enumerates the installer's ~/.ssh directory via os.homedir() and POSTs the file listing plus user/platform info to a hardcoded bare-IP endpoint https://124.221.154.135/post. Neither behavior is related to the package's stated date-formatting purpose, and both fire on npm install.
What should I do about MAL-2026-12203?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.