POC-CVE-2025-66034

fontvarlib.py — CVE-2025-66034 fontTools varLib — 任意文件写入 + XML 注入 → 远程代码执行 目录 概述 漏洞详情 攻击链 环境要求 安装 配置 使用方法 工作原理 漏洞代码 利用前检查清单 测试环境 免责声明 参考资料 概述 CVE-2025-66034 是 fontTools.varLib 可变字体生成流水线中的一个漏洞。当 Web 应用暴露此流水线并接受用户提供的 .designspace 文件时，两个弱点可串联起来，实现未认证的远程代码执行 。 fontvarlib.py 自动化了完整的利用链——字体生成、载荷构造、上传和反...

varlib-cve-2025-66034

Exploit de fontTools varLib CVE-2025-66034 Este repositorio no introduce una nueva vulnerabilidad. Este es un exploit de prueba de concepto para CVE-2025-66034 que afecta al pipeline de generación de fuentes variables varLib de fontTools. La vulnerabilidad permite a los atacantes controlar el...

CVE-2025-66034

CVE-2025-66034 — fontTools varLib 任意文件写入 漏洞描述 fontTools 是一个用于操作字体文件的 Python 库。其 varLib 模块处理 .designspace 文件——一种 XML 格式，用于描述如何插值多个字体母版以生成可变字体。 受影响版本中存在两个弱点： 1. 未净化的输出文件名 designspace 文件中的 属性控制 varLib 将编译后的输出字体写入何处。该库在将此路径传递给文件系统前未进行任何验证或规范化。攻击者可以提供绝对路径或路径遍历序列，将输出文件写入进程具有写权限的任何位置。 2. 输出中透传的 XML 内容...

CVE-2025-66034

CVE-2025-66034 — fontTools varLib Arbitrary File Write → RCE PoC exploit for an Arbitrary File Write + XML Injection vulnerability infontTools.varLib Tested on HackTheBox — VarIaType Vulnerability fontTools.varLib processes .designspace XML files to build variable fonts. Two weaknesses combine to...

PYSEC-2026-1389 fontTools is Vulnerable to Arbitrary File Write and XML injection in fontTools.varLib

Summary 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...

Exploit for XML Injection (aka Blind XPath Injection) in Fonttools

CVE-2025-66034 — fontTools varLib Arbitrary File Write → RCE...

Exploit for XML Injection (aka Blind XPath Injection) in Fonttools

fontvarlib.py — CVE-2025-66034 fontTools varLib — Arbi...

Arbitrary File Write

fontTools is vulnerable to an arbitrary file write. The vulnerability is due to improper handling of malicious .designspace files in the fontTools.varLib module, which allows an attacker to achieve remote code execution by writing arbitrary files when processed...

CVE-2025-66034

This vulnerability in fontTools varLib allows a crafted .designspace file to trigger arbitrary file writes and XML-based content injection during variable-font generation. Because filenames are not sanitized, an attacker can use path traversal to overwrite files anywhere on the filesystem, and...

SUSE CVE-2025-66034

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...

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

Summary 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...

GHSA-768J-98CG-P3FV fontTools is Vulnerable to Arbitrary File Write and XML injection in fontTools.varLib

Summary 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...

DEBIAN-CVE-2025-66034

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...

CVE-2025-66034

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...

UBUNTU-CVE-2025-66034

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...

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

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...

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

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...

CVE-2025-66034

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...

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

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...

CVE-2025-66034

CVE-2025-66034 affects fontTools, a Python font manipulation library. Affected: fontTools.varLib main() path when processing malicious .designspace files; arbitrary file write can lead to remote code execution. Impact: high (per CVSS 3.1, base 9.8) when exploited via the varLib CLI or code invoki...