FontForge Integer Overflow Vulnerability in XBM File Parsing Allowing Remote Code Execution

Vulnerability

A remote code execution vulnerability has been identified in FontForge, specifically within the GUtils component, when parsing XBM files. This issue arises from an integer overflow caused by inadequate validation of user-supplied data, allowing remote attackers to execute arbitrary code on the affected system. Exploitation requires user interaction, such as opening a malicious file or visiting a harmful webpage.

Impact

Exploitation of this vulnerability allows for arbitrary code execution on the affected system, with the executed code running in the context of the current process.

Remediation

Due to the nature of this vulnerability, the recommended mitigation strategy is to limit interactions with the product.

Added: Dec 31, 2025, 7:17 AM
Updated: Dec 31, 2025, 7:17 AM

Vulnerability Rating

Custom Algorithm
spread
5.4
impact
10.0
exploitability
4.4
remediation
7.9
relevance
1.7
threat
0.0
urgency
2.9
incentive
1.7

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.