Null Pointer Dereference in Windows Kerberos Affects Microsoft Software
CVE-2026-42903

6.5MEDIUM

Key Information:

Vendor: Microsoft
Status: Windows 10 Version 1607; Windows 10 Version 1809; Windows 10 Version 21h2; Windows 10 Version 22h2
Vendor: CVE Published:; 9 June 2026

What is CVE-2026-42903?

A null pointer dereference vulnerability in Windows Kerberos can be exploited by an authorized attacker to execute a denial of service attack over a network. This could lead to the unavailability of the affected services, negatively impacting network operations and accessibility.

Affected Version(s)

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.9234

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.8880

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.7417

References

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

vendor-advisorypatch

CVSS V3.1

Score:

6.5

Severity:

MEDIUM

Confidentiality:

None

Integrity:

None

Availability:

None

Attack Vector:

Network

Attack Complexity:

Low

Privileges Required:

Low

User Interaction:

None

Scope:

Unchanged

Download the Critical Vulnerability Management Cheat Sheet

Timeline

Vulnerability published
Jun 9, 2026
Vulnerability Reserved
Apr 30, 2026

CVE-2026-42903 Data

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