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Mozilla Firefox and Thunderbird Storage: IndexedDB Component Use-After-Free Vulnerability

Vulnerability

A use-after-free vulnerability has been identified in the Storage: IndexedDB 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.

Impact

Exploitation of this vulnerability leads to a use-after-free condition, which can commonly result in memory corruption and potentially allow for arbitrary code execution.

Remediation

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

Added: Feb 24, 2026, 2:52 PM
Updated: Feb 24, 2026, 10:54 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.