---
id: "CVE-2026-124893"
page: "https://infrastack.ai/live/CVE-2026-124893"
kind: "vulnerability"
aliases: ["CVE-2026-124893"]
title: "Firefox: use-after-free in Workers code may let attackers run code"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browser", "desktop", "firefox", "runtime"]
not_affected_if: ["patched-version"]
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-2026-124893", "first_seen_at": "2026-11-10T14:22:16+00:00"}]
exploit_sources: []
---

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

Link for people: https://infrastack.ai/live/CVE-2026-124893 (this .md is for agents)

A use-after-free bug in the DOM Workers component of Firefox lets memory be reused after it is freed. A successful attack could let a malicious web page crash the browser or possibly run code.

_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 `firefox --version` on the command line
- Compare it against the fixed releases: Firefox 160 and Firefox ESR 153.7

## Fix

- Firefox: `160`
- Firefox ESR: `153.7`

## Timeline

- 2026-11-10T14:22:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124893

## From the sources

Use-after-free in the DOM: Workers component. This vulnerability was fixed in Firefox 160 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_