CVE-2026-84122
Received Received - Intake

Use-after-free in Firefox Audio/Video Component

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: Mozilla Corporation

Description
Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, and Firefox ESR 153.2.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-01
Last Modified
2026-09-01
Generated
2026-09-01
AI Q&A
2026-09-01
EPSS Evaluated
N/A
NVD
CVE-2026-84122
EUVD
EUVD-2026-69071

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox to 155 (inc)
mozilla firefox_esr to 140.15 (inc)
mozilla firefox_esr to 153.2 (inc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a use-after-free vulnerability in Firefox's Audio/Video component. It occurs when a program continues to use memory after it has been freed, potentially leading to crashes or arbitrary code execution.

Impact Analysis

An attacker could exploit this to crash your browser or run malicious code on your device. This may allow them to steal data, install malware, or take control of your system.

Mitigation Strategies

Update Firefox to version 155 or later, Firefox ESR 140.15 or later, or Firefox ESR 153.2 or later to address the use-after-free vulnerability in the Audio/Video component.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-84122. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart