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Mozilla Firefox and Thunderbird JIT Miscompilation Vulnerability Allowing Information Disclosure

Vulnerability

A vulnerability allowing information disclosure has been identified in the Just-In-Time (JIT) compilation of the JavaScript engine used in Firefox and Thunderbird. This issue affects Firefox versions prior to 148, Firefox ESR versions prior to 140.8, Thunderbird versions prior to 148, and Thunderbird ESR versions prior to 140.8. The vulnerability arises from JIT miscompilation, which can lead to unintended information exposure.

Impact

Exploitation of this vulnerability can result in unauthorized information disclosure.

Remediation

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

Added: Feb 24, 2026, 2:43 PM
Updated: Feb 24, 2026, 10:45 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
2.5
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.