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Mozilla Firefox and Thunderbird JIT Miscompilation Vulnerability in WebAssembly Component

Vulnerability

A JIT miscompilation vulnerability has been identified in the JavaScript: WebAssembly component of Mozilla Firefox and Thunderbird. This issue affects Firefox and Thunderbird versions prior to 148. The vulnerability arises from incorrect just-in-time compilation, which could potentially be exploited to cause unintended behavior in the execution of WebAssembly code.

Impact

Exploitation of this vulnerability could lead to JIT miscompilation, causing incorrect program behavior. According to Mozilla, this type of vulnerability could be leveraged 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
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.