Mozilla Firefox and Thunderbird Use-After-Free Vulnerability in the DOM: Window and Location Component

Vulnerability

A use-after-free vulnerability has been identified in the DOM: Window and Location component of Mozilla Firefox and Thunderbird. This vulnerability affects Firefox versions prior to 148, Firefox ESR versions prior to 115.33 and 140.8, as well as Thunderbird versions prior to 148 and 140.8. The vulnerability arises from improper memory management, which can lead to memory corruption. Such memory safety issues can potentially be exploited to execute arbitrary code.

Impact

Exploitation of this vulnerability can lead to a use-after-free condition, allowing for memory corruption that could be exploited to execute arbitrary code.

Remediation

Users can upgrade to Firefox 148, Firefox ESR 140.8, or Thunderbird 148 to address this vulnerability.

Added: Feb 24, 2026, 2:41 PM
Updated: Feb 24, 2026, 10:41 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
1.9
exploitability
4.2
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.