---
id: "CVE-2026-117882"
kind: "vulnerability"
aliases: ["CVE-2026-117882"]
title: "Firefox: use-after-free in Layout component may allow code execution"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["browsers", "desktop", "firefox", "other"]
not_affected_if: ["fixed-version"]
published_at: "2026-10-27T14:16:43+00:00"
first_seen_at: "2026-10-27T14:32:21+00:00"
updated_at: "2026-10-27T14:37:56+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117882", "first_seen_at": "2026-10-27T14:32:21+00:00"}]
---

# Firefox: use-after-free in Layout component may allow code execution

A use-after-free bug in the Layout component of Firefox can be triggered and fixed in Firefox 159 and ESR 115.44 and 153.6. The sources do not state what an attacker gains beyond memory corruption.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Firefox version in the browser's About page or with `firefox --version`
- Compare against the fixed versions `159`, `115.44` and `153.6`

## Fix

- Update Firefox to `159` or later
- Update Firefox ESR to `115.44` or `153.6`

## Timeline

- 2026-10-27T14:32:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117882

## From the sources

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

---

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