EUVD-2026-56377
GHSA-vwj8-mr8p-vjfq
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only trigger with PR:L for authorized attacker; AC:H reflects double-free race/state complexity; full C/I/A for successful local privilege escalation to SYSTEM.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Double free in Windows Kerberos allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via a double-free memory corruption flaw in the Windows Kerberos implementation affects Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025. A low-privileged local attacker can exploit the CWE-415 double-free condition to achieve arbitrary code execution at an elevated privilege level, effectively gaining full control over confidentiality, integrity, and availability of the affected system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authorized (low-privileged) local user account on the affected system - the CVSS vector PR:L confirms authentication is necessary. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 score with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H reflects a real but constrained threat: exploitation is local-only and requires high attack complexity, meaning opportunistic mass exploitation is unlikely without a reliable exploit chain. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to apply Microsoft's released patch, which brings affected systems to the fixed build thresholds: Windows Server 2025 to 10.0.26100.33296 or later, Windows 11 24H2 and Server 2025 to 10.0.26100.9168 or later, Windows 11 25H2 to 10.0.26200.9168 or later, and Windows 11 26H1 to 10.0.28000.2704 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 systems across your enterprise. …
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Same weakness CWE-415 – Double Free
View allSame technique Information Disclosure
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External POC / Exploit Code
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