MAL-2026-4639 Malicious code in pg-expense-example (npm)
Malicious package
Published
MAL-2026-4639 is a malicious package: pg-expense-example (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-2026-4639/ (Markdown: https://insights.sbomify.com/MAL-2026-4639/index.md)
- Package
- pg-expense-example
- Registry
- npm
What is MAL-2026-4639?
MAL-2026-4639 is a malicious package in pg-expense-example, published on 22 May 2026.
Official description
On require/load, index.js unconditionally collects host identifiers (hostname, username, platform, arch, cwd, pid) and sends them as URL query parameters via HTTPS GET to a hardcoded Burp Collaborator-style domain
vwfmeddcdgidvdwpkigkg0l8us5vf3wtx.oast.fun. The package ships no advertised functionality — its only behavior on load is the beacon. package.json has empty author/description fields and declares an unused chalk dependency. A code comment in Azerbaijani (sənin domenin = 'your domain') is consistent with an attacker-controlled callback host, indicating PoC/reconnaissance malware rather than legitimate software.What should I do about MAL-2026-4639?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.