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    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 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.

    Published:Nov 29, 2025
    Last Modified:Dec 3, 2025
    EPS:Nov 29, 2025
    EPSS Score:0.00094
    CVSS Score:6.3

    Affected Products

    Vendor
    Fonttools
    Product
    Fonttools

    Exploits

    https://github.com/fonttools/fonttools/security/advisories/GHSA-768j-98cg-p3fvhttps://github.com/fonttools/fonttools/security/advisories/GHSA-768j-98cg-p3fvhttps://github.com/4nuxd/CVE-2025-66034https://github.com/d0x-awrqxavc/CVE-2025-66034https://github.com/jwsly12/CVE-2025-66034-htb-ctfhttps://github.com/Liquid1998/Variatype.htb-CVE-2025-66034https://github.com/symphony2colour/varlib-cve-2025-66034https://github.com/tristanqtn/CVE-2025-66034https://github.com/v3cn4x00/POC-CVE-2025-66034

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-250 XML Injection
    CAPEC-83 XPath Injection

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High