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Mozilla Firefox and Thunderbird Use-After-Free Vulnerability in WebAssembly Component

Vulnerability

A use-after-free vulnerability has been identified in the WebAssembly component of Mozilla Firefox and Thunderbird. This issue affects Firefox and Thunderbird versions prior to 148. The vulnerability arises from improper memory management, which could potentially be exploited to execute arbitrary code.

Impact

Exploitation of this vulnerability could lead to a use-after-free condition, allowing for memory corruption and potentially arbitrary code execution.

Remediation

Users can upgrade to Firefox 148 or Thunderbird 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
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.