Out-of-bounds read in Microsoft products - CVE-2026-33096
Published: April 14, 2026
Vulnerability identifier: #VU126006
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-33096
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service attack.
The vulnerability exists due to a boundary condition within the Windows HTTP.sys driver when handling HTTP/3 requests. A remote attacker can send a specially crafted HTTP request to the web server and perform a denial of service attack.
Affected software
Microsoft Internet Information Services (IIS)
Microsoft Windows
Windows Server
Microsoft Windows
Windows Server
How to mitigate CVE-2026-33096
Install updates from vendor's website.
Microsoft Windows - addressed in versions 10 1607 10.0.14393.9060, 11 23H2 10.0.22631.6936, 11 24H2 10.0.26100.32690
Windows Server - addressed in versions 2012 R2 6.3.9600.23132, 2022 23H2 10.0.25398.2274, 2022 10.0.20348.5020, 2025 10.0.26100.32690
Windows Server - addressed in versions 2012 R2 6.3.9600.23132, 2022 23H2 10.0.25398.2274, 2022 10.0.20348.5020, 2025 10.0.26100.32690