---
id: CVE-2026-118020
title: Use-after-free in the Layout component
summary: >-
  Use-after-free in the Layout component. This vulnerability was fixed in
  Firefox 159 and Thunderbird 159.
severity: none
vendor: Mozilla
product: Firefox
affected:
  - Firefox
  - Thunderbird
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T18:18:06.754Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118020'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2075977'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-118/'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-121/'
tags:
  - cve.org
ingestedAt: '2026-10-27T16:11:59.432Z'
epss: 0.00142
epssPercentile: 0.03591
---

## Overview

Use-after-free in the Layout component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.

## Affected

- `Firefox`
- `Thunderbird`

## Remediation

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