CVE-2026-16356
Received Received - Intake

Sandbox Escape via 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 Disability Access APIs 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-2026-16356
EUVD
EUVD-2026-46204

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 is a sandbox escape vulnerability caused by a use-after-free issue in the Disability Access APIs component of Firefox. A use-after-free occurs when a program continues to use memory after it has been freed, potentially allowing an attacker 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, 115.38 (ESR), or 140.13 (ESR), the system is vulnerable.

Impact Analysis

This vulnerability could allow an attacker to escape the browser sandbox and execute code on your system with the same privileges as the browser. This could lead to data theft, installation of malware, or further compromise of your system.

Mitigation Strategies

Update Firefox to version 153 or later, Firefox ESR 115.38 or later, or Firefox ESR 140.13 or later. Disable Disability Access APIs if not needed via Firefox settings.

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