CVE-2026-109717
Received Received - Intake

Use-after-free in Firefox DOM Bindings

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description
Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-19
AI Q&A
2026-10-13
EPSS Evaluated
2026-10-18
NVD
CVE-2026-109717
EUVD
EUVD-2026-98490

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 the DOM Bindings (WebIDL) component of Firefox. Use-after-free occurs when a program continues to use a pointer after freeing the memory it points to, potentially leading to crashes or arbitrary code execution.

Detection Guidance

This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. To detect if your system is vulnerable, check the installed Firefox version using commands like 'firefox --version' or 'about:support' in Firefox. If the version is below 158 (or 153.5 for ESR), the system is vulnerable.

Impact Analysis

An attacker could exploit this to crash the browser or run malicious code on your system. This may allow them to steal data, install malware, or take control of your device if you use an affected Firefox version.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance with GDPR, HIPAA, or other standards. The vulnerability involves a use-after-free in Firefox's DOM Bindings, which could potentially lead to memory corruption or arbitrary code execution. However, without explicit details on data exposure or processing, its direct effect on regulatory compliance cannot be determined from this information.

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 Bindings component.

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