---
id: CVE-2026-117876
title: 'Use-after-free in the Layout: Text and Fonts component'
summary: >-
  Use-after-free in the Layout: Text and Fonts component. This vulnerability was
  fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159,
  and Thunderbird 153.6.
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L'
cvssSource: adp
vendor: Mozilla
product: Firefox
affected:
  - Firefox
  - Thunderbird
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-04T17:26:21.222181Z'
published: '2026-10-27'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T17:26:34.033Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-117876'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2074167'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-118/'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-119/'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-120/'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-121/'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-122/'
tags:
  - cve.org
epss: 0.00187
epssPercentile: 0.08367
ingestedAt: '2026-10-27T16:11:59.361Z'
---

## Overview

Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

## Affected

- `Firefox`
- `Thunderbird`

## Remediation

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