CVE-2026-65797

Analyzed Analyzed - Analysis Complete

Numeric Truncation Error in Windows DNS Elevates Local Privileges

Publication date: 2026-08-11

Last updated on: 2026-08-17

Assigner: Microsoft Corporation

Description

Numeric truncation error in Windows DNS allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-11

Last Modified

2026-08-17

Generated

2026-09-01

AI Q&A

2026-08-11

EPSS Evaluated

2026-08-30

NVD

CVE-2026-65797

EUVD

EUVD-2026-56741

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_server_2016	to 10.0.14393.9418 (exc)
microsoft	windows_server_2022	to 10.0.20348.5440 (exc)
microsoft	windows_server_2025	to 10.0.26100.33222 (exc)
microsoft	windows_10_1809	to 10.0.17763.9121 (exc)
microsoft	windows_10_1809	to 10.0.17763.9121 (exc)
microsoft	windows_server_2019	to 10.0.17763.9121 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-197	Truncation errors occur when a primitive is cast to a primitive of a smaller size and data is lost in the conversion.
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This vulnerability is a numeric truncation error in Windows DNS that allows an authorized attacker to elevate their privileges locally on a system.

Detection Guidance

This vulnerability is a local privilege escalation in Windows DNS. Detection requires checking for unauthorized privilege changes or DNS service modifications. Review Windows Event Logs for Event ID 4688 (process creation) and Event ID 4672 (special privileges assigned). Use PowerShell commands like Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4688,4672} to inspect logs.

Impact Analysis

An attacker with local access could exploit this to gain higher privileges, potentially allowing them to take control of the affected system or perform unauthorized actions.

Compliance Impact

This vulnerability allows local privilege escalation, which could enable unauthorized access to sensitive systems or data. This may impact compliance with standards like GDPR or HIPAA by increasing the risk of data breaches or unauthorized access to protected health or personal information.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows DNS numeric truncation error. Monitor Microsoft's update guide for the specific patch.

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