CVE-2025-66034 — fontTools is Vulnerable to Arbitrary File Write and XML injection in fontTools.varLib
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 a…
Published: 2025-11-29 · CVSS: 6.3 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7