CVE-2026-109724
Deferred Deferred - Pending Action

Use-after-free in Firefox DOM Core & HTML

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-13
AI Q&A
2026-10-13
EPSS Evaluated
N/A
NVD
CVE-2026-109724
EUVD
EUVD-2026-98494

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox 158
mozilla firefox_esr 153.5
mozilla firefox to 158 (inc)
mozilla firefox_esr to 153.5 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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Executive Summary

This is a use-after-free vulnerability in Firefox's DOM: Core & HTML component. Use-after-free means a program tries to use memory after it has been freed, which can lead to crashes or arbitrary code execution. It was fixed in Firefox 158 and Firefox ESR 153.5.

Impact Analysis

An attacker could exploit this to crash your browser or run malicious code on your system. This could allow them to steal data, install malware, or take control of your device. Users of affected Firefox versions are at risk.

Mitigation Strategies

Update Firefox to version 158 or later and Firefox ESR to version 153.5 or later to address the use-after-free vulnerability in the DOM: Core & HTML component.

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