# MAL-2026-17558: Malicious code in css-txedrf-polyfill (npm)


- **Type:** Malicious package
- **Package:** `css-txedrf-polyfill` (npm)
- **Published:** 5 Oct 2026

## What is MAL-2026-17558?

MAL-2026-17558 is a malicious package in css-txedrf-polyfill, published on 5 Oct 2026. 

### Official description

thunderboltRegistry.js executes an IIFE at require time that runs OS reconnaissance commands (id, whoami, uname -a, ifconfig/ip addr, cat /etc/hosts) via child_process.execSync, URL-encodes the output together with hostname, node version, platform, and pid, and POSTs/GETs each result via fetch to the hardcoded endpoint http://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f over plain HTTP. The package's exported module names (thunderboltRegistry, siteAssetsRegistry, documentManagementRegistry, editorRegistry, corvidRegistry) impersonate Wix thunderbolt internal registry modules and the manifest references static.parastorage.com URLs, consistent with a dependency-confusion lure aimed at a private Wix namespace. Any consumer that requires one of these modules triggers the reconnaissance and exfiltration to the attacker-controlled host.

## What should I do about MAL-2026-17558?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-17558 is a malicious package: css-txedrf-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-2026-17558/ (Markdown: https://insights.sbomify.com/MAL-2026-17558/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-17558

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-17558/
Summaries are generated and may contain mistakes; the official description above is the record.