# MAL-2026-2519: Malicious code in just4testlm (PyPI)


- **Type:** Malicious package
- **Package:** `just4testlm` (PyPI)
- **Published:** 9 Apr 2026

## What is MAL-2026-2519?

MAL-2026-2519 is a malicious package in just4testlm, published on 9 Apr 2026. 

### Official description

The package likely tests different malicious techniques and delivering payload in setup.py. Different versions, like 0.1.0, 0.4.0 or 0.9.0 contain malicious payload in setup.py that either run remote script or exfiltrate env variables during installation. The malicious versions are also quickly removed and replaced with versions without malicious code.

---

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

Campaign: 2026-03-just4testlm

Reasons (based on the campaign):

 - Downloads and executes a remote malicious script.

 - exfiltration-env-variables

## What should I do about MAL-2026-2519?

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-2026-2519 is a malicious package: just4testlm (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-2026-2519/ (Markdown: https://insights.sbomify.com/MAL-2026-2519/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-2519

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-2519/
Summaries are generated and may contain mistakes; the official description above is the record.