MAL-2026-18627: Malicious code in msgpackrpc (PyPI)
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Source: kam193 (9747a902bd61a745ec9c8f569f57417303f828b441c3e4e8c95101adf1498d13) Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.
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Category: PROBABLYPENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.
Campaign: GENERIC-standard-pypi-install-pentest
Reasons (based on the campaign):
- The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.
- The package overrides the install command in setup.py to execute malicious code during installation.
Affected Software
Event History
Frequently Asked Questions
When can the package execute its malicious behavior?
The package overrides the install command in setup.py, so code can execute during installation. Importing the module also exfiltrates basic host information.
What information is exposed?
The available data states that basic system information, such as the host IP address or username, may be exfiltrated. No further details about the exact data fields or destination are provided.
Who is exposed?
Systems where this package is installed or its module is imported are exposed to the described data exfiltration. The provided data does not identify affected versions, environments, or installation methods beyond the overridden setup.py install command.