CVE-2026-84124
Received Received - Intake

Use-after-free in Firefox DOM Component

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: Mozilla Corporation

Description
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, and Firefox ESR 153.2.

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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-2026-84124
EUVD
EUVD-2026-69073

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
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a use-after-free vulnerability in the DOM Core and HTML components of Firefox. Use-after-free 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 to version 140.15 or later, or Firefox ESR to version 153.2 or later to address the use-after-free vulnerability in the DOM: Core & HTML component.

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