CVE-2026-117909
Received Received - Intake

Use-after-free in Firefox JavaScript GC

Publication date: 2026-10-27

Last updated on: 2026-10-27

Assigner: Mozilla Corporation

Description
Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.

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Meta Information

Published
2026-10-27
Last Modified
2026-10-27
Generated
2026-10-27
AI Q&A
2026-10-27
EPSS Evaluated
N/A
NVD
CVE-2026-117909
EUVD
EUVD-2026-110940

Affected Vendors & Products

Currently, no data is known.

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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 use-after-free vulnerability in the JavaScript garbage collection 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.

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. Updating to Firefox 159 or ESR 153.6 fixes the issue.

Mitigation Strategies

Update Firefox to version 159 or later and Firefox ESR to version 153.6 or later to address the use-after-free vulnerability in the JavaScript: GC component.

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