# MAL-2026-4822: Malicious code in loadtest-browser-lib (npm)


- **Type:** Malicious package
- **Package:** `loadtest-browser-lib` (npm)
- **Published:** 26 May 2026

## What is MAL-2026-4822?

MAL-2026-4822 is a malicious package in loadtest-browser-lib, published on 26 May 2026. 

### Official description

On `npm install`, the package's preinstall hook executes index.js, which collects host identifiers (hostname, username, platform, arch, cwd, pid, timestamp) and sends them as query parameters in an HTTPS request to `fxpkkxatijbbyxuhdclqig6334q9m1j8w.oast.fun`, an out-of-band callback host. package.json declares `"preinstall": "node index.js"`, so the beacon fires automatically on default install with no user interaction. The package self-describes as 'hijacking by yusif', consistent with a dependency-confusion / namespace-hijack proof-of-concept payload. Any installer running `npm install` leaks identifying machine information to the attacker's collaborator endpoint.

## What should I do about MAL-2026-4822?

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-2026-4822 is a malicious package: loadtest-browser-lib (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-2026-4822/ (Markdown: https://insights.sbomify.com/MAL-2026-4822/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-4822

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-4822/
Summaries are generated and may contain mistakes; the official description above is the record.