CVE-2026-100770
Received Received - Intake

Sandbox Escape via Use-After-Free in Firefox

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Sandbox escape due to use-after-free in the DOM: Content Processes component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100770
EUVD
EUVD-2026-88922

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox 153.4
mozilla firefox 157
mozilla firefox 115.42
mozilla firefox 140.17

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: Content Processes 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 escape browser sandbox restrictions.

Impact Analysis

This vulnerability could allow malicious websites to break out of the browser's sandbox and execute code on your system with the same privileges as the browser. This could lead to unauthorized access to sensitive data, installation of malware, or further compromise of your system.

Mitigation Strategies
  • Update Firefox ESR to version 153.4 or later, Firefox to version 157 or later, or Firefox ESR 115.42 or later, and Firefox ESR 140.17 or later.

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