---
id: "CVE-2026-117902"
kind: "vulnerability"
aliases: ["CVE-2026-117902"]
title: "Firefox: use-after-free in Layout Text and Fonts component"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["browsers", "desktop", "firefox", "other"]
not_affected_if: ["firefox-current-release"]
published_at: "2026-10-27T14:16:45+00:00"
first_seen_at: "2026-10-27T14:32:22+00:00"
updated_at: "2026-10-27T14:37:37+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117902", "first_seen_at": "2026-10-27T14:32:22+00:00"}]
---

# Firefox: use-after-free in Layout Text and Fonts component

A use-after-free bug in the Layout: Text and Fonts component of Firefox lets memory be reused after it is freed. The sources do not say what an attacker can do with it beyond that.

_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`
- Check the ESR version if running Firefox ESR, for example with `firefox --version` on the managed host

## Fix

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

## Timeline

- 2026-10-27T14:32:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117902

## From the sources

Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 159 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_