fontcase

GHSA-g72q-7v8m-7r9j

Malicious code in fontcase (PyPI)

Details

**Severity:** Critical

**Affected versions:** `= 0.1.0`

## Source: kam193 (9e2c4992e5295f2b094f3c7c2b2e6c2dbc8d0d9ca6242d58318e6e1b83a4255c)
During import, the package downloads and executes an infostealer.


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Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.


Campaign: 2026-10-fontcase


Reasons (based on the campaign):


 - infostealer


 - Downloads and executes a remote executable.


 - uses-telegram-bot


 - exfiltration-browser-data


 - exfiltration-credentials

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/c848dc5c749b4394346bb22ecb9f577a3d3e2def/osv/malicious/pypi/fontcase/MAL-2026-17862.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/fontcase
- https://github.com/ossf/malicious-packages/blob/c848dc5c749b4394346bb22ecb9f577a3d3e2def/osv/malicious/pypi/fontcase/MAL-2026-17862.json
- https://tria.ge/261013-x3rflayz4j
- https://www.virustotal.com/gui/file/08c3367965ba26fd0c2ed4ecac2fe831cf8fe517af59ce6947ae18b4fa30e20f/detection
- https://github.com/advisories/GHSA-g72q-7v8m-7r9j

Compromised versions (1)

= 0.1.0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.