---
id: "CVE-2026-124880"
page: "https://infrastack.ai/live/CVE-2026-124880"
kind: "vulnerability"
aliases: ["CVE-2026-124880"]
title: "Firefox: a use-after-free in DOM handling may let attacker run code"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browsers", "firefox", "runtime"]
not_affected_if: ["esr-115.45-or-later", "esr-153.7-or-later", "firefox-160-or-later"]
published_at: "2026-11-10T14:17:20+00:00"
first_seen_at: "2026-11-10T14:22:15+00:00"
updated_at: "2026-11-10T14:26:13+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124880", "first_seen_at": "2026-11-10T14:22:15+00:00"}]
exploit_sources: []
---

# Firefox: a use-after-free in DOM handling may let attacker run code

Link for people: https://infrastack.ai/live/CVE-2026-124880 (this .md is for agents)

Firefox has a use-after-free bug in its DOM Core and HTML component, where memory is used after it has been freed. The sources do not state what an attacker gets beyond that, so the impact is not confirmed.

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

## How to check

- Check the Firefox version with Help > About Firefox, or run `firefox --version` on the machine.
- Compare against the fixed versions: Firefox `160`, Firefox ESR `115.45`, Firefox ESR `153.7`.

## Fix

- Firefox `160`
- Firefox ESR `115.45`
- Firefox ESR `153.7`

## Timeline

- 2026-11-10T14:22:15+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124880

## From the sources

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.

---

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