Windows DWM Core Library Elevation of Privilege Vulnerability

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Summary

CVECVE-2026-42896
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-12 18:17:26 UTC
Updated2026-05-12 18:17:26 UTC
DescriptionInteger overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-122 | CWE-190 | CWE-190 CWE-190: Integer Overflow or Wraparound | CWE-122 CWE-122: Heap-based Buffer Overflow

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Windows 11 Version 24H2 affected 10.0.26100.0 10.0.26100.8457 custom ARM64-based Systems, x64-based Systems
CNA Microsoft Windows 11 Version 25H2 affected 10.0.26200.0 10.0.26200.8457 custom ARM64-based Systems, x64-based Systems
CNA Microsoft Windows 11 Version 26H1 affected 10.0.28000.0 10.0.28000.2113 custom ARM64-based Systems, x64-based Systems
CNA Microsoft Windows Server 2025 affected 10.0.26100.0 10.0.26100.32860 custom x64-based Systems
CNA Microsoft Windows Server 2025 Server Core Installation affected 10.0.26100.0 10.0.26100.32860 custom x64-based Systems

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42896 [email protected] msrc.microsoft.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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