mcpsever

GHSA-6wf3-7v76-j8g7

Malicious code in mcpsever (PyPI)

Details

**Severity:** Critical

**Affected versions:** `= 0.0.1`

## Source: kam193 (087fec121d53b905e66a2c368e905de51bc7aa3863f0777589a18d45623d3515)
During installation, the package exfiltrates env variables


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


Campaign: 2026-06-ip-rotat


Reasons (based on the campaign):


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


 - exfiltration-env-variables


 - typosquatting

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/mcpsever/MAL-2026-6384.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/mcpsever
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/mcpsever/MAL-2026-6384.json
- https://github.com/advisories/GHSA-6wf3-7v76-j8g7

Compromised versions (1)

= 0.0.1

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