---
id: CVE-2026-49160
title: HTTP.sys Denial of Service Vulnerability
summary: >-
  Uncontrolled resource consumption in HTTP/2 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-400
vendor: Microsoft
product: Windows 10 Version 1607
affected:
  - windows_10_version_1607 >= 10.0.14393.0 < 10.0.14393.9234
  - windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.8880
  - windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7417
  - windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19045.7417
  - windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7219
  - windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7219
  - windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.8655
  - windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.8655
  - windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2269
  - windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9234
  - >-
    windows_server_2016_server_core_installation >= 10.0.14393.0 <
    10.0.14393.9234
  - windows_server_2019 >= 10.0.17763.0 < 10.0.17763.8880
  - >-
    windows_server_2019_server_core_installation >= 10.0.17763.0 <
    10.0.17763.8880
  - windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5256
  - windows_server_2025 >= 10.0.26100.0 < 10.0.26100.32995
  - >-
    windows_server_2025_server_core_installation >= 10.0.26100.0 <
    10.0.26100.32995
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-06-10T14:13:38.881981Z'
exploitAvailable: true
published: '2026-06-09'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T13:44:48.611Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-49160'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49160'
    label: HTTP.sys Denial of Service Vulnerability
tags:
  - cve.org
  - exploit-available
epss: 0.01174
epssPercentile: 0.66144
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/dhmosfunk/CVE-2026-49160-CVE-2026-47291-HTTP.sys'
  checkedAt: '2026-09-25T08:20:59.961Z'
ingestedAt: '2026-09-24T14:44:21.382Z'
---

## Overview

Uncontrolled resource consumption in HTTP/2 allows an unauthorized attacker to deny service over a network.

## Affected

- `windows_10_version_1607 >= 10.0.14393.0 < 10.0.14393.9234`
- `windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.8880`
- `windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7417`
- `windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19045.7417`
- `windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7219`
- `windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7219`
- `windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.8655`
- `windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.8655`
- `windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2269`
- `windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9234`
- `windows_server_2016_server_core_installation >= 10.0.14393.0 < 10.0.14393.9234`
- `windows_server_2019 >= 10.0.17763.0 < 10.0.17763.8880`
- `windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.8880`
- `windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5256`
- `windows_server_2025 >= 10.0.26100.0 < 10.0.26100.32995`
- `windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.32995`

## Remediation

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