---
id: "CVE-2026-117985"
kind: "vulnerability"
aliases: ["CVE-2026-117985"]
title: "Firefox: use-after-free in Graphics lets web content escape the sandbox"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["browser", "desktop", "firefox", "firefox-esr", "package"]
not_affected_if: ["no-desktop-browser", "patched-version"]
published_at: "2026-10-27T14:16:56+00:00"
first_seen_at: "2026-10-27T14:32:24+00:00"
updated_at: "2026-10-27T14:35:03+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117985", "first_seen_at": "2026-10-27T14:32:24+00:00"}]
---

# Firefox: use-after-free in Graphics lets web content escape the sandbox

A use-after-free bug in Firefox's Graphics component allows a crafted page to escape the browser sandbox. An attacker who lures a user to a malicious page could gain code execution outside the sandboxed content process.

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

## How to check

- Run `firefox --version` (or check Help > About Firefox) and compare against `159` for Firefox or `153.6` for Firefox ESR
- Check the version managed by your fleet tool or package manager on each desktop image

## Fix

- Update Firefox to `159` or later
- Update Firefox ESR to `153.6` or later

## Timeline

- 2026-10-27T14:32:24+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117985

## From the sources

Sandbox escape due to use-after-free in the Graphics component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.

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