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August updates trigger 0xc0000409 errors on Windows Server 2016
September 8, 2026 · BleepingComputer · Severity: MEDIUM
Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems. The bug causes application crashes and system instability on affected servers. Microsoft has acknowledged the issue and is working on a fix to be released in a future update.
Key Takeaways
- Security patches address multiple CVEs across affected product lines
- Critical and high-severity vulnerabilities require prioritized deployment
- Review full advisory for product-specific patch guidance and mitigations