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OpenAdvisories
Malicious MAL-2025-47749

brotli-python

PyPI package · versions 99.3.1, 99.6.1, 99.99.1, 99.5.1, 99.2.1, 99.1.1, 1.9.12, 100.99.0, 1.0.9, 1.1.9, 1.2.9

Reported Sep 7, 2025 · Updated Mar 19, 2026

If this package is installed

Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.

Details

Source: kam193 (3750f9d493198c7607b7f1d5855b6e8726edb24618beeb216e5a86a4a9119e5f)
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: 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.