# MAL-2026-17521: Malicious code in rgx33-flex-layout-core (npm)


- **Type:** Malicious package
- **Package:** `rgx33-flex-layout-core` (npm)
- **Published:** 4 Oct 2026

## What is MAL-2026-17521?

MAL-2026-17521 is a malicious package in rgx33-flex-layout-core, published on 4 Oct 2026. 

### Official description

Package name and exports (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, etc.) impersonate internal Wix thunderbolt registry packages, targeting Wix build pipelines via dependency confusion. On require, thunderboltRegistry.js executes `id` and `uname -r` via child_process.execSync and collects hostname, pid, Node.js version, and platform. These values are encoded into subdomains of an attacker-controlled Interactsh/OAST callback domain (davdpb8lhot13kgmnhp0863x9g83mpswq.oast.live) and also POSTed to a webhook.site collector (webhook.site/0492a36c-4d7b-408a-865c-226db25987ba). The exfiltration behavior has no relation to the package's advertised 'flexbox layout utilities' purpose, and the manifest references to static.parastorage.com paths reinforce the Wix-targeted dependency-confusion shape.

## What should I do about MAL-2026-17521?

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-2026-17521 is a malicious package: rgx33-flex-layout-core (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-2026-17521/ (Markdown: https://insights.sbomify.com/MAL-2026-17521/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-17521

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-17521/
Summaries are generated and may contain mistakes; the official description above is the record.