# MAL-2026-15847: Malicious code in fieldbase-webapplication-buildtools (npm)


- **Type:** Malicious package
- **Package:** `fieldbase-webapplication-buildtools` (npm)
- **Published:** 3 Sep 2026

## What is MAL-2026-15847?

MAL-2026-15847 is a malicious package in fieldbase-webapplication-buildtools, published on 3 Sep 2026. 

### Official description

package.json declares preinstall and install lifecycle scripts that collect the installer's username (whoami), hostname, current working directory, and npm package name, base64-encode them, and send them to the hardcoded endpoint https://eoy34oyrep9j5x8.m.pipedream.net via both an HTTPS GET path and a DNS-lookup channel (nslookup against a subdomain of the same host). This fires automatically on `npm install` with no user interaction. The version number 99.99.99 and package name pattern are consistent with a dependency-confusion lure targeting an internal package name.

The OpenSSF Package Analysis project identified 'fieldbase-webapplication-buildtools' @ 99.99.99 (npm) as malicious.

It is considered malicious because:

- The package communicates with a domain associated with malicious activity.

- The package executes one or more commands associated with malicious behavior.

## What should I do about MAL-2026-15847?

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-2026-15847 is a malicious package: fieldbase-webapplication-buildtools (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-2026-15847/ (Markdown: https://insights.sbomify.com/MAL-2026-15847/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-15847

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-15847/
Summaries are generated and may contain mistakes; the official description above is the record.