---
id: CVE-2026-120572
title: 'Incorrect boundary conditions in the Layout: Block and Inline component'
summary: >-
  Incorrect boundary conditions in the Layout: Block and Inline component. This
  vulnerability was fixed in Firefox 159.0.1.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: adp
vendor: Mozilla
product: Firefox
affected:
  - Firefox
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-03T14:16:58.683127Z'
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T14:17:13.886Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120572'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2079035'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-123/'
tags:
  - cve.org
epss: 0.00329
epssPercentile: 0.26189
ingestedAt: '2026-11-05T19:30:42.959Z'
---

## Overview

Incorrect boundary conditions in the Layout: Block and Inline component. This vulnerability was fixed in Firefox 159.0.1.

## Affected

- `Firefox`

## Remediation

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