# MAL-2026-14016: Malicious code in preinstall-hook-webhook-callback-demo (npm)


- **Type:** Malicious package
- **Package:** `preinstall-hook-webhook-callback-demo` (npm)
- **Published:** 13 Aug 2026

## What is MAL-2026-14016?

MAL-2026-14016 is a malicious package in preinstall-hook-webhook-callback-demo, published on 13 Aug 2026. 

### Official description

package.json declares a preinstall lifecycle script that contacts webhook.site, an ephemeral request-capture service commonly used as an attacker-controlled exfiltration sink. The hook fires automatically on `npm install` before any user interaction, and webhook.site is not a first-party or documented destination for any legitimate build or runtime purpose of this package. The combination of an auto-executing preinstall script wired to an out-of-band capture endpoint is the shape of installer-side data exfiltration / callback beaconing at install time.

## What should I do about MAL-2026-14016?

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-2026-14016 is a malicious package: preinstall-hook-webhook-callback-demo (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-2026-14016/ (Markdown: https://insights.sbomify.com/MAL-2026-14016/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-14016

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-14016/
Summaries are generated and may contain mistakes; the official description above is the record.