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CVE-2026-34339— Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability

CVSS 5.5 · Medium EPSS 0.04% · P11

Affected Version Matrix 17

VendorProductVersion RangeStatus
MicrosoftWindows 10 Version 160710.0.14393.0< 10.0.14393.9140affected
MicrosoftWindows 10 Version 180910.0.17763.0< 10.0.17763.8755affected
MicrosoftWindows 10 Version 21H210.0.19044.0< 10.0.19044.7291affected
MicrosoftWindows 10 Version 22H210.0.19045.0< 10.0.19045.7291affected
MicrosoftWindows 11 version 22H310.0.22631.0< 10.0.22631.7079affected
MicrosoftWindows 11 Version 23H210.0.22631.0< 10.0.22631.7079affected
MicrosoftWindows 11 Version 24H210.0.26100.0< 10.0.26100.8457affected
MicrosoftWindows 11 Version 25H210.0.26200.0< 10.0.26200.8457affected
MicrosoftWindows 11 version 26H110.0.28000.0< 10.0.28000.2113affected
MicrosoftWindows Server 201610.0.14393.0< 10.0.14393.9140affected
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0< 10.0.14393.9140affected
MicrosoftWindows Server 201910.0.17763.0< 10.0.17763.8755affected
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0< 10.0.17763.8755affected
MicrosoftWindows Server 202210.0.20348.0< 10.0.20348.5139affected
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0< 10.0.25398.2330affected
MicrosoftWindows Server 202510.0.26100.0< 10.0.26100.32860affected
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0< 10.0.26100.32860affected
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I. Basic Information for CVE-2026-34339

Vulnerability Information
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Vulnerability Title
Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an authorized attacker to deny service locally.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
空指针解引用
Source: NVD (National Vulnerability Database)
Vulnerability Title
Microsoft Lightweight Directory Access Protocol（LDAP） 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Lightweight Directory Access Protocol（LDAP）是美国微软（Microsoft）公司的一种目录服务协议，在 TCP/IP 堆栈之上的层上运行。 Microsoft Lightweight Directory Access Protocol（LDAP）存在代码问题漏洞。攻击者利用该漏洞导致系统拒绝服务。以下产品和版本受到影响：Windows 10 Version 1809 for 32-bit Systems,Windows 10 Version 1
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
MicrosoftWindows 10 Version 1607 10.0.14393.0 ~ 10.0.14393.9140 -
MicrosoftWindows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.8755 -
MicrosoftWindows 10 Version 21H2 10.0.19044.0 ~ 10.0.19044.7291 -
MicrosoftWindows 10 Version 22H2 10.0.19045.0 ~ 10.0.19045.7291 -
MicrosoftWindows 11 version 22H3 10.0.22631.0 ~ 10.0.22631.7079 -
MicrosoftWindows 11 Version 23H2 10.0.22631.0 ~ 10.0.22631.7079 -
MicrosoftWindows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.8457 -
MicrosoftWindows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.8457 -
MicrosoftWindows 11 version 26H1 10.0.28000.0 ~ 10.0.28000.2113 -
MicrosoftWindows Server 2016 10.0.14393.0 ~ 10.0.14393.9140 -
MicrosoftWindows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.9140 -
MicrosoftWindows Server 2019 10.0.17763.0 ~ 10.0.17763.8755 -
MicrosoftWindows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.8755 -
MicrosoftWindows Server 2022 10.0.20348.0 ~ 10.0.20348.5139 -
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 ~ 10.0.25398.2330 -
MicrosoftWindows Server 2025 10.0.26100.0 ~ 10.0.26100.32860 -
MicrosoftWindows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.32860 -

II. Public POCs for CVE-2026-34339

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III. Intelligence Information for CVE-2026-34339

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Same Patch Batch · Microsoft · 2026-05-12 · 125 CVEs total

CVE-2026-428989.9 CRITICALMicrosoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
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CVE-2026-410899.8 CRITICALWindows Netlogon Remote Code Execution Vulnerability
CVE-2026-410969.8 CRITICALWindows DNS Client Remote Code Execution Vulnerability
CVE-2026-403799.3 CRITICALAzure Entra ID Spoofing Vulnerability
CVE-2026-404029.3 CRITICALWindows Hyper-V Elevation of Privilege Vulnerability
CVE-2026-428339.1 CRITICALMicrosoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
CVE-2026-331179.1 CRITICALAzure SDK for Java Security Feature Bypass Vulnerability
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CVE-2026-416138.8 HIGHVisual Studio Code Elevation of Privilege Vulnerability
CVE-2026-403578.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
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CVE-2026-411098.8 HIGHGitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability
CVE-2026-410948.8 HIGHMicrosoft Data Formulator Remote Code Execution Vulnerability
CVE-2026-404208.8 HIGHMicrosoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-404038.8 HIGHWindows Graphics Component Remote Code Execution Vulnerability
CVE-2026-403708.8 HIGHSQL Server Remote Code Execution Vulnerability
CVE-2026-410868.8 HIGHWindows Admin Center in Azure Portal Elevation of Privilege Vulnerability
CVE-2026-354398.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-331128.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability

Showing top 20 of 125 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows 10 Version 1607
Same vendor: Microsoft
Same weakness: CWE-476

V. Comments for CVE-2026-34339

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