# MAL-2026-13479: Malicious code in @cats-cdf/browser-metrics-meter (npm)


- **Type:** Malicious package
- **Package:** `@cats-cdf/browser-metrics-meter` (npm)
- **Published:** 6 Aug 2026

## What is MAL-2026-13479?

MAL-2026-13479 is a malicious package in @cats-cdf/browser-metrics-meter, published on 6 Aug 2026. 

### Official description

The package's preinstall lifecycle script runs automatically on `npm install` and executes `whoami` and `hostname`, then fetches the machine's public IP from ifconfig.me and transmits all three values as query-string parameters to a hardcoded out-of-band interaction domain (kwphewvexhjbtfduscqybx6q7c862eh0g.oast.fun) over plain HTTP via curl, with a wget fallback. The domain is an OAST (out-of-band application security testing) collector used to receive exfiltrated reconnaissance data. The behavior fires unconditionally with no first-party relationship, no consent, and no documented purpose consistent with the package name.

## What should I do about MAL-2026-13479?

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-2026-13479 is a malicious package: @cats-cdf/browser-metrics-meter (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-2026-13479/ (Markdown: https://insights.sbomify.com/MAL-2026-13479/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13479

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13479/
Summaries are generated and may contain mistakes; the official description above is the record.