MAL-2025-47749 Malicious code in brotli-python (PyPI)
- Package
- brotli-python
- Registry
- PyPI
What is MAL-2025-47749?
MAL-2025-47749 is a malicious package in brotli-python, published on 7 Sep 2025.
Official description
Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.
Category: PROBABLY_PENTEST - 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.
What should I do about MAL-2025-47749?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.