---
id: "CVE-2026-117868"
kind: "vulnerability"
aliases: ["CVE-2026-117868"]
title: "Firefox: sandbox escape in the DOM networking component, fixed in 159"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["browser", "desktop", "firefox", "other"]
not_affected_if: ["already-on-fixed-version"]
published_at: "2026-10-27T14:16:41+00:00"
first_seen_at: "2026-10-27T14:32:21+00:00"
updated_at: "2026-10-27T14:39:18+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117868", "first_seen_at": "2026-10-27T14:32:21+00:00"}]
---

# Firefox: sandbox escape in the DOM networking component, fixed in 159

A flaw in the DOM Networking component of Firefox allows escaping the browser sandbox. The sources do not describe the exact attacker capability beyond the sandbox escape.

_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`; affected builds are those before `159`, `115.44` ESR, or `153.6` ESR.
- unknown for any further check, since the sources do not say.

## Fix

- Update Firefox to `159`, or Firefox ESR to `115.44` or `153.6`.

## Timeline

- 2026-10-27T14:32:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117868

## From the sources

Sandbox escape in the DOM: Networking component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_