---
id: "CVE-2026-117956"
kind: "vulnerability"
aliases: ["CVE-2026-117956"]
title: "Firefox: invalid pointer in Nimbus Desktop Client component fixed"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["desktop", "firefox", "other"]
not_affected_if: ["updated-firefox"]
published_at: "2026-10-27T14:16:51+00:00"
first_seen_at: "2026-10-27T14:32:23+00:00"
updated_at: "2026-10-27T14:35:32+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117956", "first_seen_at": "2026-10-27T14:32:23+00:00"}]
---

# Firefox: invalid pointer in Nimbus Desktop Client component fixed

The Nimbus Desktop Client component in Firefox contains an invalid pointer bug. The sources do not say what an attacker gets beyond the memory corruption itself.

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

## How to check

- Run `firefox --version` and compare against `159` or `153.6` for ESR
- unknown for any other check

## Fix

- Update Firefox to `159` or Firefox ESR to `153.6`
- unknown for any other action

## Timeline

- 2026-10-27T14:32:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117956

## From the sources

Invalid pointer in the Nimbus Desktop Client 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_