fontus (PyPI) · Malicious Code
Affects fontusSource GCVE Database
Malicious package : remove fontus and rotate any secrets on hosts that installed it.
Data as of 29 Oct 2026, 17:52 UTC
Malicious package
Published to PyPI · OSV MAL-2026-18271
What to do
Remove fontus from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| PyPIfontus | Affected
| Fixed in– |
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Description
The fontus package versions 0.0.1, 0.0.2, and 0.0.3 on PyPI contain code that likely performs fingerprinting by exfiltrating basic system information such as IP address or username. Analysis found no evidence of more harmful behaviors like executing attacker-controlled payloads, credential theft, or persistence mechanisms. The risk is limited to basic data exfiltration without further malicious activity.