# MAL-2026-2946: Malicious code in moonbit-metrics-validator (PyPI)


- **Type:** Malicious package
- **Package:** `moonbit-metrics-validator` (PyPI)
- **Published:** 20 Apr 2026

## What is MAL-2026-2946?

MAL-2026-2946 is a malicious package in moonbit-metrics-validator, published on 20 Apr 2026. 

### Official description

Campaign includes a chain of dependencies that finally exfiltrate sensitive environment variables to a hardcoded GitHub repository as exfiltration target, and in specific environments also start a reverse shell. It appears to be targeting specifically one GitHub project, where the front-end package was included in a PR.

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Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-04-moonbit-locale-compat

Reasons (based on the campaign):

 - The malicious code is intentionally included in a dependency of the package

 - The package contains code to create a reverse shell, allowing an attacker to execute any commands on the victim's machine.

 - exfiltration-env-variables

## What should I do about MAL-2026-2946?

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-2026-2946 is a malicious package: moonbit-metrics-validator (PyPI). 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-2026-2946/ (Markdown: https://insights.sbomify.com/MAL-2026-2946/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-2946

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-2946/
Summaries are generated and may contain mistakes; the official description above is the record.