# MAL-2026-4859: Malicious code in telethon-pro-safe (PyPI)


- **Type:** Malicious package
- **Package:** `telethon-pro-safe` (PyPI)
- **Published:** 28 May 2026

## What is MAL-2026-4859?

MAL-2026-4859 is a malicious package in telethon-pro-safe, published on 28 May 2026. 

### Official description

During installation, package executes obfuscated code that starts a RAT-like software allowing remote control and exfiltrating sensitive data.

---

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

Campaign: 2026-05-telethon-pro-safe

Reasons (based on the campaign):

 - rat

 - The package overrides the install command in setup.py to execute malicious code during installation.

 - exfiltration-credentials

 - exfiltration-browser-data

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

 - The package contains code to detect if it is running in a sandbox environment.

 - The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.

 - infostealer

 - obfuscation

## What should I do about MAL-2026-4859?

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-2026-4859 is a malicious package: telethon-pro-safe (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-2026-4859/ (Markdown: https://insights.sbomify.com/MAL-2026-4859/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-4859

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-4859/
Summaries are generated and may contain mistakes; the official description above is the record.