CVE-2026-65798

Analyzed Analyzed - Analysis Complete

Numeric Truncation Error in Windows DNS Allows Privilege Escalation

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

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-65798

EUVD

EUVD-2026-56743

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.

Attack-Flow Graph

Executive Summary

This 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 involves a numeric truncation error in Windows DNS that allows local privilege escalation. Detection requires checking for unauthorized privilege changes or DNS service modifications. Review Windows Event Logs for Event ID 4672 (Special Privileges Assigned) and Event ID 4688 (Process Creation) to identify suspicious activity. Use PowerShell commands like Get-WinEvent -LogName Security | Where-Object {$_.Id -eq 4672} to filter relevant events.

Impact Analysis

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

Compliance Impact

This vulnerability allows local privilege escalation, which could enable unauthorized access to sensitive data or systems. This may impact compliance with GDPR (data protection) and HIPAA (health information security) by increasing the risk of unauthorized data exposure or breaches.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft to patch the DNS truncation error. Monitor Microsoft's advisory for patches and install them as soon as available.

Hi! I’m here to help you understand CVE-2026-65798. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70