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August updates trigger 0xc0000409 errors on Windows Server 2016

Microsoft says the August 2026 security update causes recurring CompatTelRunner.exe 0xc0000409 crashes on Windows Server 2016 with Compatibility Appraiser enabled; no functional impact.

Microsoft confirmed a known issue in which the August 2026 Windows security update generates recurring Application Error events (Event ID 1000, exception code 0xc0000409) in CompatTelRunner.exe on Windows Server 2016. The issue affects physical and virtual machines, including VMware and Azure environments, and per Microsoft does not affect device functionality. A permanent fix is planned for a future update, and the event log entries can be dismissed temporarily.

BleepingComputer · 8d agoAdvisory

Cisco Advance Notification for Publication of August 19, 2026, Security Advisories

Cisco PSIRT's advance notice previews August 19, 2026 advisories including Critical CVSS 10.0 hardening releases for Crosswork and Secure Workload.

Cisco PSIRT issued an advance notification for security advisories published August 19, 2026. The batch includes Critical-rated (CVSS 10.0) hardening releases for Cisco Crosswork and Cisco Secure Workload, a High-severity blind XML External Entity injection in BroadWorks (CVE-2026-20320, CVSS 7.5), a Medium SQL injection in Unified Intelligence Center (CVE-2026-20327, CVSS 6.5), and a RoomOS stack overflow. Full details and fixes follow in the individual advisories.