CVE-2026-42903
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Null pointer dereference in Windows Kerberos

Publication date: 2026-06-09

Last updated on: 2026-06-11

Assigner: Microsoft Corporation

Description
Null pointer dereference in Windows Kerberos allows an authorized attacker to deny service over a network.

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Meta Information

Published
2026-06-09
Last Modified
2026-06-11
Generated
2026-06-30
AI Q&A
2026-06-09
EPSS Evaluated
2026-06-28
NVD
CVE-2026-42903
EUVD
EUVD-2026-35592

Affected Vendors & Products

Showing 24 associated CPEs
Vendor Product Version / Range
microsoft windows_server_2012 r2
microsoft windows_server_2012 *
microsoft windows_10_1607 to 10.0.14393.9234 (exc)
microsoft windows_10_1607 to 10.0.14393.9234 (exc)
microsoft windows_10_1809 to 10.0.17763.8880 (exc)
microsoft windows_10_1809 to 10.0.17763.8880 (exc)
microsoft windows_10_21h2 to 10.0.19044.7417 (exc)
microsoft windows_10_21h2 to 10.0.19044.7417 (exc)
microsoft windows_10_21h2 to 10.0.19044.7417 (exc)
microsoft windows_10_22h2 to 10.0.19045.7417 (exc)
microsoft windows_10_22h2 to 10.0.19045.7417 (exc)
microsoft windows_10_22h2 to 10.0.19045.7417 (exc)
microsoft windows_11_23h2 to 10.0.22631.7219 (exc)
microsoft windows_11_23h2 to 10.0.22631.7219 (exc)
microsoft windows_11_24h2 to 10.0.26100.8655 (exc)
microsoft windows_11_24h2 to 10.0.26100.8655 (exc)
microsoft windows_11_25h2 to 10.0.26200.8655 (exc)
microsoft windows_11_25h2 to 10.0.26200.8655 (exc)
microsoft windows_11_26h1 to 10.0.28000.2269 (exc)
microsoft windows_11_26h1 to 10.0.28000.2269 (exc)
microsoft windows_server_2016 to 10.0.14393.9234 (exc)
microsoft windows_server_2019 to 10.0.17763.8880 (exc)
microsoft windows_server_2022 to 10.0.20348.5256 (exc)
microsoft windows_server_2025 to 10.0.26100.32995 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.

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Compliance Impact

The provided information does not specify how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

Executive Summary

This vulnerability is a null pointer dereference in the Windows Kerberos component. It allows an authorized attacker to cause a denial of service over a network.

Impact Analysis

The impact of this vulnerability is a denial of service (DoS) condition. An authorized attacker can exploit this flaw to disrupt the availability of services that rely on Windows Kerberos authentication.

Mitigation Strategies

This vulnerability allows an authorized attacker to cause a denial of service over a network via a null pointer dereference in Windows Kerberos.

To mitigate this vulnerability, it is recommended to apply the security updates provided by Microsoft as soon as they become available.

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