---
id: "CVE-2026-124943"
page: "https://infrastack.ai/live/CVE-2026-124943"
kind: "vulnerability"
aliases: ["CVE-2026-124943"]
title: "Firefox: use-after-free in Layout component may let attackers run code"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Firefox", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["browser", "firefox", "other"]
not_affected_if: ["firefox-160-or-later"]
published_at: "2026-11-10T14:17:28+00:00"
first_seen_at: "2026-11-10T14:22:19+00:00"
updated_at: "2026-11-10T14:24:03+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124943", "first_seen_at": "2026-11-10T14:22:19+00:00"}]
exploit_sources: []
---

# Firefox: use-after-free in Layout component may let attackers run code

Link for people: https://infrastack.ai/live/CVE-2026-124943 (this .md is for agents)

Firefox has a use-after-free bug in its Layout component, which handles how page content is arranged. Memory bugs like this can let a malicious web page crash the browser or run code on the visitor's computer.

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

## Affected

- vendor:Firefox affected range not listed fixed no fixed version listed

## How to check

- Check the installed Firefox version in Help > About Firefox

## Fix

- Firefox: move to `160` or later, per the source

## Timeline

- 2026-11-10T14:22:19+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124943

## From the sources

Use-after-free in the Layout component. This vulnerability was fixed in Firefox 160.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_