---
id: "CVE-2026-117952"
kind: "vulnerability"
aliases: ["CVE-2026-117952"]
title: "Firefox: uninitialized memory in Networking component fixed in releases"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["desktop-browsers", "enterprise-endpoints", "firefox", "other"]
not_affected_if: ["already-on-fixed-version"]
published_at: "2026-10-27T14:16:51+00:00"
first_seen_at: "2026-10-27T14:32:23+00:00"
updated_at: "2026-10-27T14:35:36+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117952", "first_seen_at": "2026-10-27T14:32:23+00:00"}]
---

# Firefox: uninitialized memory in Networking component fixed in releases

Firefox's Networking component reads memory that was never initialized, which can leak data or cause unpredictable behavior. The sources do not say whether an attacker can reliably turn this into code execution or what data is exposed.

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

## How to check

- Run `firefox --version` (or check About Firefox) and compare against the fixed versions listed below.
- Check ESR installs with `firefox --version` against `115.44` and `153.6`.

## 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

- 2026-10-27T14:32:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117952

## From the sources

Uninitialized memory 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_