CVE-2026-88123

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Read in DNS Server Causes Denial of Service

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Out-of-bounds read in DNS Server allows an authorized attacker to deny service over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-88123

EUVD

EUVD-2026-100156

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds read flaw in the DNS Server component of Microsoft Windows Server. It allows an authorized attacker to cause a denial of service by exploiting memory access beyond allocated bounds.

Impact Analysis

An attacker could exploit this to disrupt DNS services, leading to network downtime or degraded performance. Systems running affected Windows Server versions may become unresponsive or crash.

Compliance Impact

This vulnerability allows denial of service via an out-of-bounds read in DNS Server, which could disrupt critical network services. Such disruptions may impact compliance with regulations requiring availability of systems, such as GDPR's data protection requirements or HIPAA's access controls for healthcare data.

Mitigation Strategies

Apply the latest security updates from Microsoft for affected DNS Server versions to patch the out-of-bounds read vulnerability.

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