# MAL-2026-5993: Malicious code in sheratan_test_p (npm)


- **Type:** Malicious package
- **Package:** `sheratan_test_p` (npm)
- **Published:** 17 Jun 2026

## What is MAL-2026-5993?

MAL-2026-5993 is a malicious package in sheratan_test_p, published on 17 Jun 2026. 

### Official description

On `npm install`, the package's postinstall.js executes `whoami` via child_process and POSTs the output (along with stderr, error, and a timestamp) to a hardcoded webhook.site collector URL. The package self-describes as 'A simple date formatting utility' and contains no code matching that purpose; the only behavior on install is the host-identity beacon. Package metadata is consistent with a throwaway exfiltration artifact (placeholder name `sheratan_test_p`, empty author, generic description). Any developer or CI runner installing this package leaks their user/host context to an attacker-controlled third-party collector.

## What should I do about MAL-2026-5993?

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-2026-5993 is a malicious package: sheratan_test_p (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-2026-5993/ (Markdown: https://insights.sbomify.com/MAL-2026-5993/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-5993

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-5993/
Summaries are generated and may contain mistakes; the official description above is the record.