MAL-2026-13692 Malicious code in chai-jsonss (npm)
Malicious package
Published
MAL-2026-13692 is a malicious package: chai-jsonss (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-2026-13692/ (Markdown: https://insights.sbomify.com/MAL-2026-13692/index.md)
- Package
- chai-jsonss
- Registry
- npm
What is MAL-2026-13692?
MAL-2026-13692 is a malicious package in chai-jsonss, published on 10 Aug 2026.
Official description
On import, index.js invokes postCallers() which resolves a base64-encoded URL stored in lib/const.js (decoding to https://1uznbx.s.gy/7xdQmt), GETs the response via axios, base64-decodes response.data.model, and passes it to new Function(require) — executing attacker-controlled JavaScript in-process. The destination is hidden as a DEV_API_KEY field on a fake process.env-shaped local module, and the payload URL is a shortlink to a mutable remote resource. The package name resembles chai but its main entry contains no chai-related functionality; the only import-time behavior is fetch-and-eval of remote code.
What should I do about MAL-2026-13692?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.