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CVE-2026-47288: Windows Kerberos Integer Overflow Allows Remote Code Execution

CVE-2026-47288 · published 4 months ago

Summary

An attacker on a nearby network can execute malicious code on a Windows system using Kerberos. This happens when the system processes large numbers, causing an error that the attacker can exploit. To stay safe, ensure your Windows systems are up to date with the latest security patches.

What to do

Update microsoft windows_server_2016 to version 10.0.14393.9234 or later.
Update microsoft windows_server_2019 to version 10.0.17763.8880 or later.
Update microsoft windows_server_2022 to version 10.0.20348.5256 or later.
Update microsoft windows_server_2025 to version 10.0.26100.32995 or later.
Update microsoft windows server 2012 to version 6.2.9200.26132 or later.
Update microsoft windows server 2012 (server core installation) to version 6.2.9200.26132 or later.
Update microsoft windows server 2012 r2 to version 6.3.9600.23228 or later.
Update microsoft windows server 2012 r2 (server core installation) to version 6.3.9600.23228 or later.
Update microsoft windows server 2016 to version 10.0.14393.9234 or later.
Update microsoft windows server 2016 (server core installation) to version 10.0.14393.9234 or later.
Update microsoft windows server 2019 to version 10.0.17763.8880 or later.
Update microsoft windows server 2019 (server core installation) to version 10.0.17763.8880 or later.
Update microsoft windows server 2022 to version 10.0.20348.5256 or later.
Update microsoft windows server 2025 to version 10.0.26100.32995 or later.
Update microsoft windows server 2025 (server core installation) to version 10.0.26100.32995 or later.

Affected software

Vendor	Product	Affected versions
microsoft	windows_server_2012	r2 `cpe:2.3:o:microsoft:windows_server_2012:-:::::::*`
microsoft	windows_server_2016	< 10.0.14393.9234 `cpe:2.3:o:microsoft:windows_server_2016::::::::`
microsoft	windows_server_2019	< 10.0.17763.8880 `cpe:2.3:o:microsoft:windows_server_2019::::::::`
microsoft	windows_server_2022	< 10.0.20348.5256 `cpe:2.3:o:microsoft:windows_server_2022::::::::`
microsoft	windows_server_2025	< 10.0.26100.32995 `cpe:2.3:o:microsoft:windows_server_2025:::::::x64:*`
microsoft	windows server 2012	< 6.2.9200.26132
microsoft	windows server 2012 (server core installation)	< 6.2.9200.26132
microsoft	windows server 2012 r2	< 6.3.9600.23228
microsoft	windows server 2012 r2 (server core installation)	< 6.3.9600.23228
microsoft	windows server 2016	< 10.0.14393.9234
microsoft	windows server 2016 (server core installation)	< 10.0.14393.9234
microsoft	windows server 2019	< 10.0.17763.8880
microsoft	windows server 2019 (server core installation)	< 10.0.17763.8880
microsoft	windows server 2022	< 10.0.20348.5256
microsoft	windows server 2025	< 10.0.26100.32995
microsoft	windows server 2025 (server core installation)	< 10.0.26100.32995

Original advisory text

Windows Kerberos Key Distribution Center (KDC) Remote Code Execution

Integer overflow or wraparound in Windows Kerberos allows an authorized attacker to execute code over an adjacent network.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47288 Vendor Advisory

Fix within

Internet-facing 14 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker full control

Severity

7.1 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-190Integer Overflow

Timeline

Published9 Jun 2026

Updated4 Nov 2026

First seen10 Jun 2026

Sources

CVE-2026-47288 · NVD

CVE-2026-47288 · MITRE

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