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CVE-2025-66034

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CVE-2025-66034

Published: Nov 29, 2025

Modified: Dec 1, 2025

PUBLISHED

CVSS v3.1

6.3

MEDIUM

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.

VendorProductVersions

fonttools

fonttools

affected
>= 4.33.0, < 4.60.2

Weaknesses (CWE)

CWE-91

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:L

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

None

Integrity

High

Availability

Low

References

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