---
id: "CVE-2026-117907"
kind: "vulnerability"
aliases: ["CVE-2026-117907"]
title: "Firefox: use-after-free in Networking component fixed in 159"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["desktop-browsers", "esr", "firefox", "runtime"]
not_affected_if: []
published_at: "2026-10-27T14:16:46+00:00"
first_seen_at: "2026-10-27T14:32:22+00:00"
updated_at: "2026-10-27T14:37:31+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117907", "first_seen_at": "2026-10-27T14:32:22+00:00"}]
---

# Firefox: use-after-free in Networking component fixed in 159

A use-after-free bug in the Networking component of Firefox could let a crafted condition corrupt memory. The sources do not say what an attacker gets beyond that, such as code execution.

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

## How to check

- Check the Firefox version in the browser's About page or with `firefox --version`
- Unknown whether a non-browser Firefox build or ESR channel is in use beyond the versions listed

## Fix

- Update Firefox to `159` or later
- Update Firefox ESR 115 to `115.44` or later
- Update Firefox ESR 153 to `153.6` or later

## Timeline

- 2026-10-27T14:32:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117907

## From the sources

Use-after-free in the 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_