# MAL-2026-3251: Malicious code in puan31 (PyPI)


- **Type:** Malicious package
- **Package:** `puan31` (PyPI)
- **Published:** 3 May 2026

## What is MAL-2026-3251?

MAL-2026-3251 is a malicious package in puan31, published on 3 May 2026. 

### Official description

During import, package automatically starts a connection to a C2 server, exfiltrates information about the host and data like the browser's history and sensitive files, and then waits for remote commands to execute.

---

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

Campaign: 2026-05-puan3

Reasons (based on the campaign):

 - exfiltration-generic

 - exfiltration-browser-data

 - The package contains code to execute remote commands (probably limited to a specific set) on the victim's machine.

 - exfiltration-credentials

 - rat

## What should I do about MAL-2026-3251?

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-2026-3251 is a malicious package: puan31 (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-2026-3251/ (Markdown: https://insights.sbomify.com/MAL-2026-3251/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-3251

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-3251/
Summaries are generated and may contain mistakes; the official description above is the record.