MAL-2026-18271 Malicious code in fontus (PyPI)

Analysis of fontus 0.0.3 on PyPI did not identify any code paths that exfiltrate installer data, execute attacker-controlled payloads at install or import time, relay caller-supplied data to third-party destinations, distribute live credentials, or establish persistence. No install-time network fetches, no lifecycle shell execution, no reads of credential paths (~/.aws, ~/.ssh, ~/.npmrc, browser profiles), and no obfuscated or dynamic-exec patterns were observed.

The package most likely performs fingerprinting by exfiltrating basic information and available fonts, with no other functionality.

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: 2026-10-fontus

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.