# MAL-2025-6387: Malicious code in udn_extras (npm)


- **Type:** Malicious package
- **Package:** `udn_extras` (npm)
- **Published:** 28 Jul 2025

## What is MAL-2025-6387?

MAL-2025-6387 is a malicious package in udn_extras, published on 28 Jul 2025. 

### Official description

The package is a malware because it contains a postinstall script that executes index.js. The index.js script gathers sensitive information such as hostname, platform, username, IP address, and environment variables and sends it to an external server (webhook.site) via an HTTPS POST request. This constitutes data exfiltration and is a clear indicator of malicious behavior.

## What should I do about MAL-2025-6387?

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-2025-6387 is a malicious package: udn_extras (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-2025-6387/ (Markdown: https://insights.sbomify.com/MAL-2025-6387/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2025-6387

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From sbomify Insights: https://insights.sbomify.com/MAL-2025-6387/
Summaries are generated and may contain mistakes; the official description above is the record.