SB2025112880 - Arbitrary file write in fontTools
Published: November 28, 2025
Security Bulletin ID
SB2025112880
Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Path traversal (CVE-ID: CVE-2025-66034)
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to input validation error when processing .designspace files in fontTools.varLib. A remote attacker can trick the victim into passing a specially crafted file and overwrite arbitrary files on the system.
Remediation
Install update from vendor's website.