---
id: CVE-2026-109748
title: 'Use-after-free in the JavaScript: WebAssembly component'
summary: >-
  Use-after-free in the JavaScript: WebAssembly component. This vulnerability
  was fixed in Firefox 158.
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'
cwe:
  - CWE-416
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T16:19:16.897'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109748'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2067169'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-106/'
    label: security@mozilla.org
tags:
  - nvd
ingestedAt: '2026-10-13T13:27:04.006Z'
---

## Overview

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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.