CVE-2026-100811
Received Received - Intake

Use-After-Free Sandbox Escape 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: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, 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-2026-100811
EUVD
EUVD-2026-88790

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
mozilla firefox to 153.4 (inc)
mozilla firefox 157
mozilla firefox to 140.17 (inc)
mozilla firefox 153.4
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 is a sandbox escape vulnerability caused by a use-after-free issue in the DOM Core and HTML components of Firefox. It allows an attacker to break out of the browser's sandbox, potentially gaining access to the host system.

Impact Analysis

If exploited, this vulnerability could allow malicious code to run outside the browser's sandbox, potentially leading to unauthorized access to system resources, data theft, or installation of malware on your device.

Compliance Impact

This vulnerability could lead to data breaches, which may violate GDPR and HIPAA compliance requirements. Organizations using affected Firefox versions may face legal penalties, reputational damage, and loss of customer trust.

Mitigation Strategies

Update Firefox ESR to version 153.4 or later and Firefox to version 157 or later to address the use-after-free vulnerability in the DOM: Core & HTML component.

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