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CVE-2025-66034
ANC
CriticalConfirmedExploit available

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 python…

CVSS
9.8
Critical
EPSS
0.00
p22
Published
2025-01-01
Updated
2025-01-01
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.

Tags · CWE
Pre-auth
CWE-91
CAPEC-83
CAPEC-250
Affected products
Fonttools 4.33.0–4.60.2
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Timeline
2025-01-01
Published
2025-01-01
Updated
CVSS 3.1 breakdown
Attack Vector
AV: N
Network (N)
Attack Complexity
AC: L
Low (L)
Privileges Required
PR: N
None (N)
User Interaction
UI: N
None (N)
Scope
S: U
Unchanged (U)
Confidentiality Impact
C: H
High (H)
Integrity Impact
I: H
High (H)
Availability Impact
A: H
High (H)
Exploit indicators
EPSS
0.001 · p22
Known exploited (KEV)
No
Known exploits — Сканер-ВС
CVE-2025-66034
github-poc · https://github.com/4nuxd/CVE-2025-66034
Enterprise
Affected software
ProductVendorStatus
Tracked
fonttoolsTracked
fonttoolsTracked
fonttoolsTracked
fonttoolsTracked
fonttoolsTracked
fonttoolsTracked
fonttoolsTracked
fonttoolsTracked
fonttools*Tracked