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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.
| 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 fonttools (Ubuntu Pro)Upgrade python3-fonttools (Ubuntu Pro)Upgrade python3-fonttoolsUpgrade fonttools | Dec 10, 2025 | Nov 29, 2025 |
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