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Mozilla Firefox and Firefox ESR Uninitialized Memory Vulnerability in Web Codecs Component

Vulnerability

A vulnerability has been identified in the Audio/Video: Web Codecs component of Mozilla Firefox and Firefox ESR. This issue stems from uninitialized memory, which can lead to potential memory corruption. The vulnerability is present in Firefox versions prior to 150 and in Firefox ESR versions prior to 140.10.

Impact

Exploitation of this vulnerability could result in memory corruption, with the potential to execute arbitrary code.

Remediation

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

Added: Apr 21, 2026, 2:34 PM
Updated: Apr 21, 2026, 2:34 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
0.6
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.