HTTP.sys Denial of Service Vulnerability

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Summary

CVECVE-2026-33096
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-14 18:17:31 UTC
Updated2026-04-17 19:32:17 UTC
DescriptionOut-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to deny service over a network.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.001700000 probability, percentile 0.382530000 (date 2026-04-20)

Problem Types: CWE-125 | CWE-125 CWE-125: Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Microsoft Windows 11 23h2 All All All All
Operating System Microsoft Windows 11 23h2 All All All All
Operating System Microsoft Windows 11 24h2 All All All All
Operating System Microsoft Windows 11 24h2 All All All All
Operating System Microsoft Windows 11 25h2 All All All All
Operating System Microsoft Windows 11 25h2 All All All All
Operating System Microsoft Windows 11 26h1 All All All All
Operating System Microsoft Windows 11 26h1 All All All All
Operating System Microsoft Windows Server 2022 All All All All
Operating System Microsoft Windows Server 2022 23h2 All All All All
Operating System Microsoft Windows Server 2025 All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Windows 11 Version 22H3 affected 10.0.22631.0 10.0.22631.6936 custom ARM64-based Systems
CNA Microsoft Windows 11 Version 23H2 affected 10.0.22631.0 10.0.22631.6936 custom x64-based Systems
CNA Microsoft Windows 11 Version 24H2 affected 10.0.26100.0 10.0.26100.8246 custom ARM64-based Systems, x64-based Systems
CNA Microsoft Windows 11 Version 25H2 affected 10.0.26200.0 10.0.26200.8246 custom ARM64-based Systems, x64-based Systems
CNA Microsoft Windows 11 Version 26H1 affected 10.0.28000.0 10.0.28000.1836 custom ARM64-based Systems, x64-based Systems
CNA Microsoft Windows Server 2022 affected 10.0.20348.0 10.0.20348.5020 custom x64-based Systems
CNA Microsoft Windows Server 2022 23H2 Edition Server Core Installation affected 10.0.25398.0 10.0.25398.2274 custom x64-based Systems
CNA Microsoft Windows Server 2025 affected 10.0.26100.0 10.0.26100.32690 custom x64-based Systems
CNA Microsoft Windows Server 2025 Server Core Installation affected 10.0.26100.0 10.0.26100.32690 custom x64-based Systems

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33096 [email protected] msrc.microsoft.com Mitigation, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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