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Mozilla Firefox and Firefox ESR Use-After-Free Vulnerability in JavaScript: GC Component

Vulnerability

A use-after-free vulnerability has been identified in the JavaScript: GC component of Mozilla Firefox. This issue affects Firefox versions prior to 147 and Firefox ESR versions prior to 140.7. The vulnerability arises from improper memory management, which can potentially be exploited to cause memory corruption.

Impact

Exploitation of this vulnerability leads to a use-after-free condition, which can commonly be exploited to execute arbitrary code or cause a crash.

Remediation

Users can upgrade to Firefox 147 or Firefox ESR 140.7 to address this vulnerability.

Added: Jan 13, 2026, 2:29 PM
Updated: Jan 13, 2026, 10:03 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
10.0
exploitability
4.4
remediation
7.7
relevance
2.0
threat
0.0
urgency
2.9
incentive
0.8

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.