MAL-2026-11543 Malicious code in simple-date-formatter-new-5 (npm)
Malicious package
Published
MAL-2026-11543 is a malicious package: simple-date-formatter-new-5 (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-2026-11543/ (Markdown: https://insights.sbomify.com/MAL-2026-11543/index.md)
- Package
- simple-date-formatter-new-5
- Registry
- npm
What is MAL-2026-11543?
MAL-2026-11543 is a malicious package in simple-date-formatter-new-5, published on 4 Aug 2026.
Official description
Package advertised as a date-formatting utility performs supply-chain attack behavior. package.json declares a postinstall shell one-liner that, on npm install, collects kernel version, IP addresses, Kubernetes API probes, cloud instance metadata (AWS 169.254.169.254 and Alibaba 100.100.100.200), an internal /24 TCP scan, ARP/DNS data, and a listing of /var/run/secrets/kubernetes.io/serviceaccount/, then POSTs the aggregated output via curl to http://safjhdvsfwzhieemkdzbgr54r0yjhrmok.oast.fun/escinfo9. The main module (index.js) additionally enumerates ~/.ssh for key files on require() and issues an HTTPS POST containing the directory listing plus username and platform to hardcoded IP 124.221.154.135:443/post. The advertised formatDate export is a trivial cover for the exfiltration code paths.
What should I do about MAL-2026-11543?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.