# MAL-2026-5486: Malicious code in menu-filter-widget-web (npm)


- **Type:** Malicious package
- **Package:** `menu-filter-widget-web` (npm)
- **Published:** 9 Jun 2026

## What is MAL-2026-5486?

MAL-2026-5486 is a malicious package in menu-filter-widget-web, published on 9 Jun 2026. 

### Official description

package.json declares a postinstall lifecycle hook that runs callback.js on every npm install. callback.js reads os.hostname() and sends it to a hardcoded oastify.com (Burp Collaborator) URL via HTTPS GET, with a fallback DNS lookup that embeds the hostname as a subdomain label. Both channels carry a unique token plus the installer's hostname, registering the install with a remote attacker-controlled collaborator on every install. The package self-describes as a 'PoC' but is published to the public registry, so any installer leaks host identity automatically without consent.

## What should I do about MAL-2026-5486?

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-2026-5486 is a malicious package: menu-filter-widget-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-2026-5486/ (Markdown: https://insights.sbomify.com/MAL-2026-5486/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-5486

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-5486/
Summaries are generated and may contain mistakes; the official description above is the record.