Mozilla Firefox and Thunderbird Race Condition Vulnerability in JavaScript: GC Component

Vulnerability

A race condition vulnerability has been identified in the JavaScript garbage collection component of Mozilla Firefox and Thunderbird. This issue affects Firefox and Thunderbird versions prior to 148. The vulnerability arises from a race condition, which can lead to unexpected behavior in the application.

Impact

Exploitation of this vulnerability creates a race condition, which can lead to unpredictable application behavior. In the context of memory management, such race conditions can often be manipulated to cause memory corruption, potentially allowing for arbitrary code execution.

Remediation

Users can upgrade to Firefox or Thunderbird version 148 to address this vulnerability.

Added: Feb 24, 2026, 2:28 PM
Updated: Feb 24, 2026, 10:32 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
0.6
exploitability
3.8
remediation
7.7
relevance
3.1
threat
0.0
urgency
2.9
incentive
0.0

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