Null Pointer Dereference in Windows LDAP Affects Microsoft Products
CVE-2026-34339

5.5MEDIUM

Key Information:

Vendor: Microsoft
Status: Windows 10 Version 1607; Windows 10 Version 1809; Windows 10 Version 21h2; Windows 10 Version 22h2
Vendor: CVE Published:; 12 May 2026

What is CVE-2026-34339?

A null pointer dereference issue in the Windows Lightweight Directory Access Protocol (LDAP) allows authorized attackers to exploit the system, potentially leading to a denial of service. This vulnerability can be triggered locally, impacting the availability of the affected services.

Affected Version(s)

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.9140

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.8755

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.7291

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...

vendor-advisorypatch

CVSS V3.1

Score:

5.5

Severity:

MEDIUM

Confidentiality:

None

Integrity:

None

Availability:

None

Attack Vector:

Local

Attack Complexity:

Low

Privileges Required:

Low

User Interaction:

None

Scope:

Unchanged

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Timeline

Vulnerability published
May 12, 2026
Vulnerability Reserved
Mar 26, 2026

CVE-2026-34339 Data

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