---
id: CVE-2026-109716
title: Incorrect boundary conditions in the JavaScript Engine component
summary: >-
  Incorrect boundary conditions in the JavaScript Engine component. This
  vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5,
  Thunderbird 158, and Thunderbird 153.5.
severity: none
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T19:18:35.203'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109716'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2073269'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-106/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-107/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-108/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-109/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-110/'
    label: security@mozilla.org
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-13T13:27:03.994Z'
vendor: Mozilla
product: Firefox
affected:
  - Firefox
  - Thunderbird
---

## Overview

Incorrect boundary conditions in the JavaScript Engine component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

## Remediation

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