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...

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...