---
id: "CVE-2026-124894"
page: "https://infrastack.ai/live/CVE-2026-124894"
kind: "vulnerability"
aliases: ["CVE-2026-124894"]
title: "Firefox: use-after-free in cookie 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: ["firefox-160-or-later", "firefox-esr-153.7-or-later"]
published_at: "2026-11-10T14:17:22+00:00"
first_seen_at: "2026-11-10T14:22:16+00:00"
updated_at: "2026-11-10T14:25:59+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124894", "first_seen_at": "2026-11-10T14:22:16+00:00"}]
exploit_sources: []
---

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

Link for people: https://infrastack.ai/live/CVE-2026-124894 (this .md is for agents)

A use-after-free bug in Firefox's cookie networking code can corrupt memory when a page is loaded. The sources do not state what an attacker gets beyond memory corruption.

_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; the sources do not give a version range for affected releases beyond the fixed releases.

## Fix

- Firefox: move to `160` or later.
- Firefox ESR: move to `153.7` or later.

## Timeline

- 2026-11-10T14:22:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124894

## From the sources

Use-after-free in the Networking: Cookies component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.

---

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