CVE-2026-49160

HIGH

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

Title source: manual
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-49160. PoCs published by dhmosfunk.

AI-analyzed exploit summary 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.

Description

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

Exploits (1)

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
devstral-2 · 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 0.0097
EPSS Percentile 57.1%
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