# MAL-2026-6789: Malicious code in @checkrhq/adjudication-api-client (npm)


- **Type:** Malicious package
- **Package:** `@checkrhq/adjudication-api-client` (npm)
- **Published:** 2 Jul 2026

## What is MAL-2026-6789?

MAL-2026-6789 is a malicious package in @checkrhq/adjudication-api-client, published on 2 Jul 2026. 

### Official description

package.json declares a preinstall lifecycle script that runs `curl` to POST installer reconnaissance data — hostname, current user (whoami), working directory, and uid/gid (id) — to a hardcoded webhook.site collector endpoint on every `npm install`. The package is published under an @checkrhq scope impersonating Checkr Inc. (author email uses checkr.com; description states 'This package is for testing only.') and ships no functional code, matching the canonical dependency-confusion beacon pattern targeting an organization's internal package namespace. Installing this package causes automatic outbound transmission of host and user identifiers to an anonymous third-party collector controlled by the publisher.

The OpenSSF Package Analysis project identified '@checkrhq/adjudication-api-client' @ 0.0.2 (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-2026-6789?

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-2026-6789 is a malicious package: @checkrhq/adjudication-api-client (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-2026-6789/ (Markdown: https://insights.sbomify.com/MAL-2026-6789/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-6789

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-6789/
Summaries are generated and may contain mistakes; the official description above is the record.