fontTools is a library for manipulating fonts, written in Python. In versions from 4.33.0 to before 4.60.2, the fonttools varLib (or python3 -m fontTools.varLib) script has an arbitrary file write vulnerability that leads to remote code execution when a malicious .designspace file is processed. The vulnerability affects the main() code path of fontTools.varLib, used by the fonttools varLib CLI and any code that invokes fontTools.varLib.main(). This issue has been patched in version 4.60.2.
CVSS Details
- CVSS 3.1 Base Score: 6.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade fonttools | May 17, 2026 | May 17, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Nov 29, 2025 |
| Ubuntu | — | Upgrade fonttoolsUpgrade python3-fonttoolsUpgrade python3-fonttools (Ubuntu Pro)Upgrade fonttools (Ubuntu Pro) | Dec 10, 2025 | Nov 29, 2025 |
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