---
id: CVE-2026-33096
title: HTTP.sys Denial of Service Vulnerability
summary: >-
  Out-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to deny
  service over a network.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-125
vendor: Microsoft
product: Windows 11 version 22H3
affected:
  - windows_11_version_22h3 >= 10.0.22631.0 < 10.0.22631.6936
  - windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.6936
  - windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.8246
  - windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.8246
  - windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.1836
  - windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5020
  - >-
    windows_server_2022_23h2_edition_server_core_installation >= 10.0.25398.0 <
    10.0.25398.2274
  - windows_server_2025 >= 10.0.26100.0 < 10.0.26100.32690
  - >-
    windows_server_2025_server_core_installation >= 10.0.26100.0 <
    10.0.26100.32690
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-04-15T10:41:00.591723Z'
published: '2026-04-14'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T17:25:30.634Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-33096'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33096'
    label: HTTP.sys Denial of Service Vulnerability
tags:
  - cve.org
epss: 0.01174
epssPercentile: 0.6615
ingestedAt: '2026-09-25T18:14:20.441Z'
---

## Overview

Out-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to deny service over a network.

## Affected

- `windows_11_version_22h3 >= 10.0.22631.0 < 10.0.22631.6936`
- `windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.6936`
- `windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.8246`
- `windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.8246`
- `windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.1836`
- `windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5020`
- `windows_server_2022_23h2_edition_server_core_installation >= 10.0.25398.0 < 10.0.25398.2274`
- `windows_server_2025 >= 10.0.26100.0 < 10.0.26100.32690`
- `windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.32690`

## Remediation

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