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CVE-2025-66034
Good to know:
Date: November 28, 2025
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.
Severity Score
Related Resources (5)
Severity Score
Weakness Type (CWE)
XML Injection (aka Blind XPath Injection)
CWE-91Top Fix
Upgrade Version
Upgrade to version fonttools - 4.60.2;fonttools - 4.60.2;https://github.com/fonttools/fonttools.git - 4.60.2
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | LOCAL |
| Attack Complexity (AC): | HIGH |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | REQUIRED |
| Scope (S): | CHANGED |
| Confidentiality (C): | NONE |
| Integrity (I): | HIGH |
| Availability (A): | LOW |