mylib-utils

GHSA-mcv5-5348-7w42

Malicious code in mylib-utils (PyPI)

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## Source: kam193 (8cc746751844570c4d9de0acc1fc4aba45c1316434c664fc70711749720f88f1)
During import, a remote executable is automatically started. During analysis, the executable only showed a basic message. It's likely experimenting with malicious techniques to prepare for real malicious action.


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


Campaign: 2026-04-mylib-utils


Reasons (based on the campaign):


 - Downloads and executes a remote executable.


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

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/mylib-utils/MAL-2026-2860.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/mylib-utils
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/mylib-utils/MAL-2026-2860.json
- https://www.virustotal.com/gui/file/8940de7a6d555e91bff304bb1ed30ecd6ee94e9ab231078db51cca95e117e290/detection
- https://github.com/advisories/GHSA-mcv5-5348-7w42

Compromised versions (1)

= 1.0.0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.