CVE-2025-66034 | THREATINT

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.

PUBLISHED Reserved 2025-11-21 | Published 2025-11-29 | Updated 2025-12-01 | Assigner GitHub_M

MEDIUM: 6.3CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:L

Problem types

CWE-91: XML Injection (aka Blind XPath Injection)

Product status

>= 4.33.0, < 4.60.2

affected

References

github.com/...ttools/security/advisories/GHSA-768j-98cg-p3fv exploit

github.com/...ttools/security/advisories/GHSA-768j-98cg-p3fv

github.com/...ommit/a696d5ba93270d5954f98e7cab5ddca8a02c1e32

cve.org (CVE-2025-66034)

nvd.nist.gov (CVE-2025-66034)

Download JSON