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Mozilla Firefox and Firefox ESR Use-After-Free Vulnerability in the JavaScript Engine Component

Vulnerability

A use-after-free vulnerability has been identified in the JavaScript Engine component of Mozilla Firefox. This issue affects Firefox versions prior to 150, as well as Firefox ESR versions prior to 115.35 and 140.10. The vulnerability arises from improper memory management, allowing for potential exploitation scenarios.

Impact

Exploitation of this vulnerability could lead to memory corruption, with evidence suggesting that it could be leveraged to execute arbitrary code.

Remediation

Users can upgrade to Firefox 150, Firefox ESR 115.35, or Firefox ESR 140.10 to address this vulnerability.

Added: Apr 21, 2026, 3:07 PM
Updated: Apr 21, 2026, 3:07 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
7.5
exploitability
4.2
remediation
7.7
relevance
6.4
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.