# MAL-2026-6291: Malicious code in @outmarket/ui (npm)


- **Type:** Malicious package
- **Package:** `@outmarket/ui` (npm)
- **Published:** 23 Jun 2026

## What is MAL-2026-6291?

MAL-2026-6291 is a malicious package in @outmarket/ui, published on 23 Jun 2026. 

### Official description

package.json declares a postinstall script that runs automatically on `npm install` and performs `require('https').get(...)` to a Burp Collaborator subdomain (`7rzjsf29azci2qjsm6kxt23ag1mtanyc.oastify.com`), passing `os.hostname()` and `os.userInfo().username` as query parameters. Any developer or build system installing this package leaks host identity to an external attacker-controlled OAST endpoint. The package's own description (`PENTEST-PoC: Dependency confusion - SecurifyAI engagement 2026-06-23`) and the version `9.9.9` published under the `@outmarket` scope indicate the package is designed to win resolution against an internal private package of the same name and harvest beacons from anyone in the targeted organization who installs it.

## What should I do about MAL-2026-6291?

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-2026-6291 is a malicious package: @outmarket/ui (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-2026-6291/ (Markdown: https://insights.sbomify.com/MAL-2026-6291/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-6291

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-6291/
Summaries are generated and may contain mistakes; the official description above is the record.