CVE-2026-16351
Received Received - Intake

DOM Navigation Use-After-Free in Firefox

Publication date: 2026-07-21

Last updated on: 2026-07-21

Assigner: Mozilla Corporation

Description
Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13.

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Meta Information

Published
2026-07-21
Last Modified
2026-07-21
Generated
2026-07-21
AI Q&A
2026-07-21
EPSS Evaluated
N/A
NVD
CVE-2026-16351
EUVD
EUVD-2026-46192

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox 153
mozilla firefox_esr 115.38
mozilla firefox_esr 140.13

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 vulnerability is a sandbox escape caused by a use-after-free bug in the DOM Navigation component of Firefox. A use-after-free occurs when a program continues to use memory after it has been freed, potentially allowing attackers to execute arbitrary code or gain elevated privileges.

Detection Guidance

Detection requires checking Firefox version. Run 'firefox --version' or check 'about:support' in Firefox. If version is below 153 (standard) or 115.38/140.13 (ESR), the system is vulnerable.

Impact Analysis

This vulnerability could allow an attacker to escape the browser sandbox and execute malicious code on your system. If exploited, it may lead to unauthorized access, data theft, or installation of malware. Users of affected Firefox versions are at risk until they update to the patched versions.

Mitigation Strategies

Update Firefox to version 153 or later, Firefox ESR 115.38 or later, or Firefox ESR 140.13 or later. Disable automatic updates temporarily if needed until patches are applied.

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