Microsoft: Domain Controller lookup may fail on Windows Server 2016
ID: 78362103-260b-56cb-8cc6-9b387038afa2
STIX ID: report--78362103-260b-56cb-8cc6-9b387038afa2
Feed Name: Bleeping Computer
Threat Score
Microsoft confirmed that the KB5087537 May 2026 update can break domain controller discovery on Windows Server 2016 hosts whose computer names are exactly 15 characters long, causing DCLocator calls to return ERROR_INVALID_PARAMETER and potentially breaking administrative operations such as DFS Namespace management; the company is investigating and has not provided a remediation timeline.
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