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Mozilla Firefox and Thunderbird Use-After-Free Vulnerability in the JavaScript: GC Component

Vulnerability

A use-after-free 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 could potentially be exploited to cause memory corruption, which might be leveraged to execute arbitrary code.

Impact

Exploitation of this vulnerability could lead to memory corruption, with the potential to execute arbitrary code.

Remediation

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

Added: Feb 24, 2026, 2:33 PM
Updated: Feb 24, 2026, 10:35 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
7.5
exploitability
4.4
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.