High MSRC-CVE-2026-88236 1 CVE

Microsoft QUIC Denial of Service Vulnerability

Published Nov 10, 2026 · Updated Nov 10, 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
10.0.20348.5870 — https://support.microsoft.com/help/5131090
10.0.22631.7711 — https://support.microsoft.com/help/5131087
10.0.26100.9974 — https://support.microsoft.com/help/5132061
10.0.26100.9911 — https://support.microsoft.com/help/5132043
10.0.26100.33822 — https://support.microsoft.com/help/5131080
10.0.26100.33730 — https://support.microsoft.com/help/5131077
10.0.28000.3501 — https://support.microsoft.com/help/5132059

Vulnerabilities 1

High 7.5

CVE-2026-88236

Microsoft QUIC Denial of Service Vulnerability

Null pointer dereference in Microsoft QUIC allows an unauthorized attacker to deny service over a network.

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

Nov 10, 2026

Revision history

2026-11-10 #1
Information published.

References

CVE-2026-88236 Microsoft QUIC Denial of Service Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88236
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