EUVD-2026-56683
GHSA-x8g5-chp9-995x
Severity by source
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Local vector confirmed by description; PR:H required because only an authorized high-privilege local user can interact with the DNS component to trigger the truncation overflow.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Numeric truncation error in Windows DNS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows DNS across a wide range of Windows 10, Windows 11, and Windows Server releases exploits a numeric truncation error (CWE-122, heap-based buffer overflow) to allow an authorized local attacker with high privileges to fully compromise the vulnerable system. Affected builds span from Windows Server 2012 through Windows Server 2025 and Windows 11 26H1, with vendor-supplied patches now available from Microsoft MSRC. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local attacker who holds a high-privilege account (PR:H per CVSS vector) - specifically an authorized user with administrative, DNS service management, or equivalent elevated rights on the target Windows system. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 6.7 (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) accurately reflects the real-world risk profile: local attack vector and a high privilege prerequisite (PR:H) substantially constrain exploitability. … 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 Microsoft's vendor-supplied security updates, available via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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