MAL-2026-17487 Malicious code in css-snap-target-polyfill (npm)
Malicious package
Published
MAL-2026-17487 is a malicious package: css-snap-target-polyfill (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-2026-17487/ (Markdown: https://insights.sbomify.com/MAL-2026-17487/index.md)
- Package
- css-snap-target-polyfill
- Registry
- npm
What is MAL-2026-17487?
MAL-2026-17487 is a malicious package in css-snap-target-polyfill, published on 4 Oct 2026.
Official description
The package ships thunderboltRegistry.js, which uses child_process and process.platform to collect host information and POSTs it via fetch() to the hardcoded external endpoint http://dxpoc.gt.tc. The destination is unrelated to any CSS polyfill functionality the package name advertises, is served over cleartext HTTP, and is not caller-configurable. This behavior does not correspond to the declared purpose of a CSS snap-target polyfill, which has no legitimate need to execute shell commands or beacon host details to a third-party domain.
What should I do about MAL-2026-17487?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.