CVE-2026-49160

HIGH

Microsoft Windows HTTP.sys HTTP/2 - Denial of Service

Title source: manual
STIX 2.1

Exploitation Summary

EIP tracks 3 public exploits for CVE-2026-49160. PoCs published by HORKimhab, dhmosfunk.

AI-analyzed exploit summary The repository contains no actual exploit code or technical details about CVE-2026-49160, instead linking to external GitHub repositories and an encrypted archive hosted on a third-party storage service. This is a hallmark of social engineering lures.

Description

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

Exploits (3)

github SUSPICIOUS
by HORKimhab · poc
https://github.com/HORKimhab/poc-cve-collection/tree/main/2026/49xxx/CVE-2026-49160.md

The repository contains no actual exploit code or technical details about CVE-2026-49160, instead linking to external GitHub repositories and an encrypted archive hosted on a third-party storage service. This is a hallmark of social engineering lures.

Classification
Suspicious 98%
Attack Type
Dos
Complexity
Unknown
Reliability
Unknown
Target: HTTP.sys (unspecified version)
No auth needed
Prerequisites: Network access to target
mistral-large-3 · analyzed Jul 13, 2026 Full analysis →
github WORKING POC
by dhmosfunk · pythonpoc
https://github.com/dhmosfunk/CVE-2026-49160-CVE-2026-47291-HTTP.sys

This repository contains a functional Python-based PoC for CVE-2026-49160 and CVE-2026-47291, targeting HTTP.sys vulnerabilities. The exploit leverages HTTP/2 header manipulation to trigger a denial-of-service (DoS) condition, with detailed technical analysis provided in the README.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Microsoft HTTP.sys (HTTP Protocol Stack)
No auth needed
Prerequisites: HTTP/2 support on target server · Network connectivity to target
mistral-large-3 · analyzed Jun 16, 2026 Full analysis →
nomisec WORKING POC
by dhmosfunk · poc
https://github.com/dhmosfunk/CVE-2026-49160-HTTP.sys

This repository contains a functional Python script that exploits CVE-2026-49160, a denial-of-service vulnerability in HTTP.sys. The exploit sends a crafted HTTP/2 request with an excessive number of headers to trigger the vulnerability.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Microsoft HTTP.sys
No auth needed
Prerequisites: HTTP/2 support on the target server · Network connectivity to the target
mistral-large-3 · analyzed Jun 16, 2026 Full analysis →

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
HTTP.sys Denial of Service Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49160

Scores

CVSS v3 7.5
EPSS 0.5383
EPSS Percentile 98.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-400
Status published
Products (27)
Microsoft/Windows 10 Version 1607 10.0.14393.0 - 10.0.14393.9234
Microsoft/Windows 10 Version 1809 10.0.17763.0 - 10.0.17763.8880
Microsoft/Windows 10 Version 21H2 10.0.19044.0 - 10.0.19044.7417
Microsoft/Windows 10 Version 22H2 10.0.19045.0 - 10.0.19045.7417
Microsoft/Windows 11 version 23H2 10.0.22631.0 - 10.0.22631.7219
Microsoft/Windows 11 Version 24H2 10.0.26100.0 - 10.0.26100.8655
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26200.8655
Microsoft/Windows 11 version 26H1 10.0.28000.0 - 10.0.28000.2269
Microsoft/Windows Server 2016 10.0.14393.0 - 10.0.14393.9234
Microsoft/Windows Server 2016 (Server Core installation) 10.0.14393.0 - 10.0.14393.9234
... and 17 more
Published Jun 09, 2026
Tracked Since Jun 09, 2026