CVE-2026-84119
Received Received - Intake

DOM Navigation Use-After-Free Vulnerability in Firefox

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: Mozilla Corporation

Description
Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, 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-2026-84119
EUVD
EUVD-2026-69064

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 155 (inc)
mozilla firefox_esr to 115.40 (inc)
mozilla firefox_esr to 140.15 (inc)
mozilla firefox_esr to 153.2 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a sandbox escape caused by a use-after-free error in the DOM Navigation component of Firefox. A use-after-free occurs when a program tries to use memory that has already been freed, potentially allowing malicious code to execute outside the sandboxed environment.

Impact Analysis

This vulnerability could allow an attacker to break out of the browser's sandbox and execute arbitrary code on your system. This might lead to unauthorized access to sensitive data, installation of malware, or further compromise of your device.

Mitigation Strategies

Update Firefox to version 155 or later, Firefox ESR to version 115.40 or later, Firefox ESR to version 140.15 or later, or Firefox ESR to version 153.2 or later to address the vulnerability.

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