# MAL-2026-5830: Malicious code in unico-check (npm)


- **Type:** Malicious package
- **Package:** `unico-check` (npm)
- **Published:** 15 Jun 2026

## What is MAL-2026-5830?

MAL-2026-5830 is a malicious package in unico-check, published on 15 Jun 2026. 

### Official description

package.json declares a preinstall lifecycle hook that runs `curl` against `https://webhook.site/fe1246c2-ac04-4493-b223-fe34ba26b79f`, passing the installer's hostname, current user, working directory, full `uname -a` output, and `$HOME` as query parameters. The beacon fires automatically on `npm install` with no user interaction. The package ships no source files, declares no main entry, and uses the implausible version `9.9.9` — the canonical shape of a dependency-confusion / typosquat reconnaissance package targeting builds that may resolve a private `unico-check` from the public registry. The package's only effect on installation is to leak host identifiers to an anonymous, attacker-controlled webhook.site bin, staging follow-on compromise.

The OpenSSF Package Analysis project identified 'unico-check' @ 9.9.9 (npm) as malicious.

It is considered malicious because:

- The package executes one or more commands associated with malicious behavior.

## What should I do about MAL-2026-5830?

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-2026-5830 is a malicious package: unico-check (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-2026-5830/ (Markdown: https://insights.sbomify.com/MAL-2026-5830/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-5830

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-5830/
Summaries are generated and may contain mistakes; the official description above is the record.