MAL-2026-17551 Malicious code in css-gvqmfn-polyfill (npm)
Malicious package
Published
MAL-2026-17551 is a malicious package: css-gvqmfn-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-2026-17551/ (Markdown: https://insights.sbomify.com/MAL-2026-17551/index.md)
- Package
- css-gvqmfn-polyfill
- Registry
- npm
What is MAL-2026-17551?
MAL-2026-17551 is a malicious package in css-gvqmfn-polyfill, published on 5 Oct 2026.
Official description
css-gvqmfn-polyfill mimics Wix internal @wix/thunderbolt-* CSS polyfill naming and ships a Proxy-based cover stub that re-exports registry names (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, etc.) as no-op functions to appear functional. On require of thunderboltRegistry.js, an IIFE unconditionally executes
id, whoami, uname -a, ifconfig/ip addr, and cat /etc/hosts via child_process, collects os.hostname, Node version, platform, and pid, and sends the output together with an rce-poc beacon to the hardcoded attacker endpoint http://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f over plain HTTP. The accompanying registry-manifest.min.json points sibling registries to parastorage.com URLs that do not host this file, consistent with a dependency-confusion lure targeting Wix build environments.What should I do about MAL-2026-17551?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.