CVE-2026-109725
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, Firefox ESR 115.43, 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-2026-109725
EUVD
EUVD-2026-98643

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox to 158 (inc)
mozilla firefox_esr to 115.43 (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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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. It occurs when a program continues to use memory after it has been freed, potentially leading to crashes or arbitrary code execution.

Detection Guidance

Detection requires checking Firefox version. Run 'firefox --version' or check 'about:support' in Firefox. Versions below 158, ESR 115.43, or ESR 153.5 are vulnerable.

Impact Analysis

An attacker could exploit this to crash your browser or run malicious code on your system. This may allow them to steal data, install malware, or take control of your device.

Mitigation Strategies

Update Firefox to version 158 or later, Firefox ESR 115.43 or later, or Firefox ESR 153.5 or later. Disable automatic updates temporarily if needed until patched.

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