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Mozilla Firefox and Thunderbird Undefined Behavior Vulnerability

Vulnerability

A vulnerability causing undefined behavior has been identified in the DOM: Core & HTML component, affecting multiple versions of Firefox and Thunderbird. Specifically, this issue impacts 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.

Impact

Exploitation of this vulnerability leads to undefined behavior, which can commonly result in memory corruption or other unpredictable application behavior.

Remediation

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

Added: Feb 24, 2026, 2:49 PM
Updated: Feb 24, 2026, 10:53 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.