CVE-2026-109761
Received Received - Intake

Use-after-free in Firefox JavaScript WebAssembly

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158.

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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-2026-109761
EUVD
EUVD-2026-98521

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mozilla firefox 158

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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 WebAssembly component of Firefox. It occurs when a program continues to use memory after it has been freed, potentially leading to crashes or arbitrary code execution.

Detection Guidance

This vulnerability is specific to Firefox 158 and earlier versions. Detection involves checking Firefox version and monitoring for unusual JavaScript or WebAssembly activity. Update Firefox to version 158 or later to mitigate the issue.

Impact Analysis

An attacker could exploit this to execute arbitrary code, crash the browser, or perform other malicious actions. Users running vulnerable Firefox versions are at risk if they visit a specially crafted website.

Mitigation Strategies

Update Firefox to version 158 or later to address the use-after-free vulnerability in the JavaScript: WebAssembly component.

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