puan4

GHSA-4w4p-q2mc-5pq2

Malicious code in puan4 (PyPI)

Details

**Severity:** Critical

**Affected versions:** `= 1.0.3`

## Source: kam193 (6be2e7028440f68ad3621664d195d72288e6a1d8658f16a421f3ec52d63d6f7a)
During import, package automatically starts a connection to a C2 server, exfiltrates information about the host and data like sensitive files and browsers' data.


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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.


 - rat


 - exfiltration-credentials

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/puan4/MAL-2026-3244.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/puan4
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/puan4/MAL-2026-3244.json
- https://github.com/advisories/GHSA-4w4p-q2mc-5pq2

Compromised versions (1)

= 1.0.3

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