# MAL-2026-4634: Malicious code in osep-react-antd (npm)


- **Type:** Malicious package
- **Package:** `osep-react-antd` (npm)
- **Published:** 22 May 2026

## What is MAL-2026-4634?

MAL-2026-4634 is a malicious package in osep-react-antd, published on 22 May 2026. 

### Official description

package.json declares `preinstall: node index.js`, which runs automatically on `npm install`. index.js collects host identifiers (os.hostname(), process.platform, arch, os.homedir(), os.userInfo() including uid/gid/username/shell, cwd) and the output of `whoami` and `id` via child_process, then POSTs the JSON payload to a hardcoded URL `https://qtn11857tbs7r8jtj0bj2250xr3jrafz.oastify.com/detox56`. The oastify.com host is Burp Suite Collaborator out-of-band infrastructure used to receive callbacks from compromised installers. The package name mimics React/Ant Design naming conventions and ships empty author/description/license metadata with no functional code beyond the beacon — the dependency-confusion squat shape. Installer harm: every `npm install` of this package leaks the installer's hostname, username, uid/gid, and shell to the attacker, identifying internal corporate environments and CI runners for follow-on targeting.

## What should I do about MAL-2026-4634?

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-2026-4634 is a malicious package: osep-react-antd (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-2026-4634/ (Markdown: https://insights.sbomify.com/MAL-2026-4634/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-4634

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-4634/
Summaries are generated and may contain mistakes; the official description above is the record.