mpkg123

GHSA-7qj6-fh4w-2jj3

Malicious code in mpkg123 (PyPI)

Details

**Severity:** Critical

**Affected versions:** `= 0.0.0`

## Source: kam193 (df9e0498d827adeb16ea11e4a1137133d2124f039942b776f7ac098a257cd164)
If executed as a module, the obfuscated code collects and exfiltrates sensitive data, including passwords saved in a browser.


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


Campaign: 2026-05-old-mpkg123


Reasons (based on the campaign):


 - infostealer


 - obfuscation


 - A Telegram webhook is used to send collected data.


 - exfiltration-browser-data

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/mpkg123/MAL-2026-3426.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/mpkg123
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/mpkg123/MAL-2026-3426.json
- https://github.com/advisories/GHSA-7qj6-fh4w-2jj3

Compromised versions (1)

= 0.0.0

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