---
id: CVE-2026-40369
title: >-
  Heap-based buffer overflow in Windows Kernel allows an authorized attacker to
  elevate privileges locally.
summary: >-
  Heap-based buffer overflow in Windows Kernel allows an authorized attacker to
  elevate privileges locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-822
published: '2026-05-12'
updated: '2026-06-26'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-40369'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40369'
    label: secure@microsoft.com
tags:
  - nvd
  - exploit-available
epss: 0.00333
epssPercentile: 0.23864
ingestedAt: '2026-06-26T16:43:13.641Z'
exploits:
  github: 6
  githubRepos:
    - 'https://github.com/orinimron123/CVE-2026-40369-EXPLOIT'
    - 'https://github.com/piffd0s/ntoskrnl-metadata'
    - 'https://github.com/0xBlackash/CVE-2026-40369'
  checkedAt: '2026-09-25T08:20:56.414Z'
exploitAvailable: true
---

## Overview

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.