---
id: CVE-2026-118004
title: Incorrect boundary conditions in the CSS Transitions and Animations component
summary: >-
  Incorrect boundary conditions in the CSS Transitions and Animations component.
  This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird
  159, and Thunderbird 153.6.
severity: none
vendor: Mozilla
product: Firefox
affected:
  - Firefox
  - Thunderbird
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T18:30:31.194Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118004'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2077756'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-118/'
  - 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
ingestedAt: '2026-10-27T16:11:59.426Z'
epss: 0.00181
epssPercentile: 0.07782
---

## Overview

Incorrect boundary conditions in the CSS Transitions and Animations component. This vulnerability was fixed in Firefox 159, 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.