CVE-2025-66034

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.

The following products are affected by CVE-2025-66034 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-66034.

URL	Resource
https://github.com/fonttools/fonttools/commit/a696d5ba93270d5954f98e7cab5ddca8a02c1e32
https://github.com/fonttools/fonttools/security/advisories/GHSA-768j-98cg-p3fv
https://nvd.nist.gov/vuln/detail/CVE-2025-66034
https://www.cve.org/CVERecord?id=CVE-2025-66034