CVEvulnerability

CVE-2025-66034

9.8 CRITICAL Published 2025-11-29 Modified 2026-10-18 Official page ↗
Status
Analyzed
Published
2025-11-29
Last modified
2026-10-18
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.3 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:L
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-91

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 configurations

• fonttools fonttools (>= 4.33.0 < 4.60.2)

Related

Weakness · CWE (1)

  • CWE-91 XML Injection weakness

References