CVE-2026-92052: Privilege escalation due to uninitialized memory in the Graphics: CanvasWebGL component

Published Sep 15, 2026

Updated

Privilege escalation due to uninitialized memory in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156 and Firefox ESR 153.3.

Affected Software

2 affected components

Mozilla Firefox>=undefined

Mozilla Firefox ESR>=undefined

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade Firefox to a version that resolves this vulnerability.
Fixed in 156
Upgrade
Upgrade Firefox ESR to a version that resolves this vulnerability.
Fixed in 153.3

Event History

Sep 15, 2026

CVE Published

via MITRE·12:34 PM

Data Sourced

via MITRE·12:34 PM

Description

Frequently Asked Questions

Which Firefox releases contain the fix?

The issue was fixed in Firefox 156 and Firefox ESR 153.3.

What component should teams focus on when assessing this issue?

The vulnerability is in the Graphics: CanvasWebGL component and involves uninitialized memory that can lead to privilege escalation.