High MSRC-CVE-2026-72949 1 CVE

Windows SMB Server Network Transport Driver (srvnet.sys) Denial of Service Vulnerability

Published Sep 8, 2026 · Updated Sep 8, 2026

Vendor: Microsoft

Summary

Impact: Denial of Service. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

Security updates
10.0.20348.5622 — https://support.microsoft.com/help/5122882
10.0.26100.33438 — https://support.microsoft.com/help/5122871
10.0.26200.9445 — https://support.microsoft.com/help/5124008
10.0.22631.7582 — https://support.microsoft.com/help/5122880
10.0.28000.2954 — https://support.microsoft.com/help/5124012

Vulnerabilities 1

High 7.5

CVE-2026-72949

Windows SMB Server Network Transport Driver (srvnet.sys) Denial of Service Vulnerability

Null pointer dereference in Windows SMB Server Network Transport Driver (srvnet.sys) allows an unauthorized attacker to deny service over a network.

Microsoft Windows Server 2022 Windows Server 2025 Windows Server 2025 (Server Core installation) Windows

Sep 8, 2026

Revision history

2026-09-08 #1
Information published.

References

CVE-2026-72949 Windows SMB Server Network Transport Driver (srvnet.sys) Denial of Service Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72949
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss