MAL-2026-856 Malicious code in chai-prop (npm)
Malicious package
Published
MAL-2026-856 is a malicious package: chai-prop (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-2026-856/ (Markdown: https://insights.sbomify.com/MAL-2026-856/index.md)
- Package
- chai-prop
- Registry
- npm
What is MAL-2026-856?
MAL-2026-856 is a malicious package in chai-prop, published on 11 Feb 2026.
Official description
The package chai-prop was found to contain malicious code.
Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
What should I do about MAL-2026-856?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.
Sources
Also known as GHSA-4p6w-3gcj-crr5.