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Mozilla Firefox and Firefox ESR Race Condition Vulnerability in WebRender Component Allowing Use-After-Free

Vulnerability

A race condition vulnerability leading to a use-after-free error has been identified in the WebRender component of Mozilla Firefox. This issue affects Firefox versions prior to 149, as well as Firefox ESR versions prior to 115.34 and prior to 140.9.

Impact

Exploitation of this vulnerability creates a race condition that can be manipulated to cause a use-after-free error, potentially leading to memory corruption.

Remediation

Users can upgrade to Firefox 149 or Firefox ESR 115.34 or 140.9 to address this vulnerability.

Added: Mar 24, 2026, 2:10 PM
Updated: Mar 24, 2026, 2:10 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
1.3
exploitability
4.0
remediation
7.7
relevance
4.6
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.