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CVE-2025-66034— fontTools is Vulnerable to Arbitrary File Write and XML injection in fontTools.varLib

Quick assessment

Affected
fonttools fonttools
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FontTools是FontTools开源的一个用 Python 编写的用于操作字体的库。 FontTools 4.33.0版本至4.60.2之前版本存在安全漏洞，该漏洞源于处理恶意.designspace文件时存在任意文件写入，可能导致远程代码执行。

CVSS 6.3 · Medium EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-66034

Vulnerability Information
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Vulnerability Title
fontTools is Vulnerable to Arbitrary File Write and XML injection in fontTools.varLib
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
XML注入(XPath盲注)
Source: CVE Program / CVE List V5
Vulnerability Title
FontTools 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FontTools是FontTools开源的一个用 Python 编写的用于操作字体的库。 FontTools 4.33.0版本至4.60.2之前版本存在安全漏洞，该漏洞源于处理恶意.designspace文件时存在任意文件写入，可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fonttools fonttools >= 4.33.0, < 4.60.2 -

II. Public POCs for CVE-2025-66034

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III. Intelligence Information for CVE-2025-66034

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IV. Related Vulnerabilities

Same product: fonttools
Same vendor: fonttools
Same weakness: CWE-91

V. Comments for CVE-2025-66034

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