EUVD-2026-56653
GHSA-fq4c-hmmq-4xx5
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attacker with a low-privilege account triggers heap overflow in Kerberos for full system compromise; no elevated privileges, user interaction, or non-default configuration required.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Kerberos allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in Windows Kerberos affects the full breadth of supported Windows versions, from Server 2012 through Windows 11 26H1 and Server 2025. An attacker holding a valid low-privilege local account can trigger a heap corruption condition in the Kerberos implementation to achieve complete confidentiality, integrity, and availability impact on the compromised host - effectively gaining SYSTEM-level control. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid low-privilege local account on the target system, as confirmed by the CVSS vector metric PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 base score (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) is well-calibrated: local access and a low-privilege account are the only prerequisites, while the impact is total compromise of the local system across all three CIA dimensions. … 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 | Apply the patches released by Microsoft and documented in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62752. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, obtain and deploy the vendor-released patches from Microsoft MSRC to all Windows systems, prioritizing domain-joined servers and critical infrastructure. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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