MAL-2026-10047 Malicious code in chai-as-staged (npm)
Malicious package
Published
MAL-2026-10047 is a malicious package: chai-as-staged (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-2026-10047/ (Markdown: https://insights.sbomify.com/MAL-2026-10047/index.md)
- Package
- chai-as-staged
- Registry
- npm
What is MAL-2026-10047?
MAL-2026-10047 is a malicious package in chai-as-staged, published on 9 Jul 2026.
Official description
Package name impersonates the popular
chai-as-promised testing library and the README is copied from pino. The advertised usage chai.use(chaiAsStaged) triggers a detached node child process that runs lib/initializeCaller.js. That file hides its C2 endpoint and a custom HTTP header name/value as base64 strings stored under decoy names (DEV_API_KEY, DEV_SECRET_KEY, DEV_SECRET_VALUE) inside a fake local process object; at runtime it base64-decodes the URL to https://amethyst-lorrin-26.tiiny.site/index.json, fetches it with the obfuscated header, extracts the .cookie field from the JSON response, and executes the returned JavaScript via new Function.constructor('require', response)(require) in a retry loop. Attacker-controlled code is therefore executed on the installer's machine with full require access whenever the library is used as documented. The combination of name/README impersonation, base64-obfuscated C2 on an anonymous static-hosting host, and dynamic code construction with require removes any benign interpretation.What should I do about MAL-2026-10047?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.
Sources
Also known as GHSA-fchw-g3j3-hxh3.