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CVE PROGRAM SOURCE RECORD6.3 Medium

CVE-2025-66034

fontTools is Vulnerable to Arbitrary File Write and XML injection in fontTools.varLib

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

fonttools fonttools

  • >= 4.33.0, < 4.60.2affected

References