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Windows CVE-2026-20863

HIGH
Double Free (CWE-415)
2026-01-13 secure@microsoft.com
Windows Windows 11 24h2 Windows Server 2022 Windows 11 25h2 Windows Server 2022 23h2 Windows 11 23h2 Windows Server 2025 Microsoft
7.0
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.0 HIGH
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 13, 2026 - 18:16 nvd
HIGH 7.0

DescriptionCVE.org

Double free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

AnalysisAI

Double free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally. [CVSS 7.0 HIGH]

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious input to Win32K ICOMP
Delivery
Trigger double free vulnerability
Exploit
Corrupt heap memory
Execution
Achieve code execution
Impact
Escalate privileges to system level
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Vulnerability AssessmentAI

Exploitation Local access required with low-privilege user account. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 7.0 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker could exploit this vulnerability to compromise the affected system.
Remediation Monitor vendor advisories for a patch. Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 7 days: Identify all affected systems and apply vendor patches promptly. …

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CVE-2026-20863 vulnerability details – vuln.today
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