---
id: "CVE-2026-117984"
kind: "vulnerability"
aliases: ["CVE-2026-117984"]
title: "Firefox: incorrect boundary handling in scrolling and overflow layout"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browser", "desktop", "firefox", "runtime"]
not_affected_if: ["already-updated-browser"]
published_at: "2026-10-27T14:16:56+00:00"
first_seen_at: "2026-10-27T14:32:24+00:00"
updated_at: "2026-10-27T14:35:06+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117984", "first_seen_at": "2026-10-27T14:32:24+00:00"}]
---

# Firefox: incorrect boundary handling in scrolling and overflow layout

Mozilla Firefox has a flaw in how its Layout Scrolling and Overflow component handles boundary conditions. The sources do not say what an attacker gets from it beyond the general memory-safety-style class of bug.

_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 with `159` or `153.6` for ESR.

## Fix

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

## Timeline

- 2026-10-27T14:32:24+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117984

## From the sources

Incorrect boundary conditions in the Layout: Scrolling and Overflow component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.

---

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