CVE-2026-105016

Microsoft QUIC Remote Code Execution Vulnerability

CVE-2026-105016 is fixed in 22 products on 2 platforms, first by Microsoft .NET Windows Desktop Runtime 8.0 8.0.32, released October 5, 2026. 3 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: Urgent.

UrgentFixed on 2 platforms

CVSS

9.8

Critical

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0166

76th percentile

<p>Heap-based buffer overflow in Microsoft QUIC allows an unauthorized attacker to execute code over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
.NET 8.0 runtime installed on Windows		KB5130034	Oct 13, 2026
.NET 9.0 runtime installed on Windows		KB5130035	Oct 13, 2026
Windows 11 Version 23H2 for ARM64-based Systems	22631.7652	KB5126653	Oct 13, 2026
Windows 11 Version 23H2 for x64-based Systems	22631.7652	KB5126653	Oct 13, 2026
Windows 11 Version 24H2 for ARM64-based Systems		KB5127648	Oct 13, 2026
Windows 11 Version 24H2 for x64-based Systems		KB5127648	Oct 13, 2026
Windows 11 Version 25H2 for ARM64-based Systems		KB5127648	Oct 13, 2026
Windows 11 Version 25H2 for x64-based Systems		KB5127648	Oct 13, 2026
Windows 11 Version 26H1 for ARM64-based Systems	28000.3231	KB5127646	Oct 13, 2026
Windows 11 Version 26H2 for ARM64-based Systems		KB5127648	Oct 13, 2026
Windows 11 Version 26H2 for x64-based Systems		KB5127648	Oct 13, 2026
Windows 11 version 26H1 for x64-based Systems	28000.3231	KB5127646	Oct 13, 2026
Windows Server 2022	20348.5761	KB5126655	Oct 13, 2026
Windows Server 2022 (Server Core installation)	20348.5761	KB5126655	Oct 13, 2026
Windows Server 2025	26100.33650	KB5126646	Oct 13, 2026
Windows Server 2025 (Server Core installation)	26100.33650	KB5126646	Oct 13, 2026
Windows apps
Microsoft .NET Windows Desktop Runtime 10.0	10.0.14	Microsoft .NET Windows Desktop Runtime 10.0 10.0.14	Oct 22, 2026
Microsoft .NET Windows Desktop Runtime 8.0	8.0.32	Microsoft .NET Windows Desktop Runtime 8.0 8.0.32	Oct 5, 2026
Microsoft .NET Windows Desktop Runtime 9.0	9.0.21	Microsoft .NET Windows Desktop Runtime 9.0 9.0.21	Oct 5, 2026
Microsoft ASP.NET Core Hosting Bundle 10.0	10.0.14	Microsoft ASP.NET Core Hosting Bundle 10.0 10.0.14	Oct 23, 2026
Microsoft ASP.NET Core Hosting Bundle 8.0	8.0.32	Microsoft ASP.NET Core Hosting Bundle 8.0 8.0.32	Oct 5, 2026
Microsoft ASP.NET Core Hosting Bundle 9.0	9.0.21	Microsoft ASP.NET Core Hosting Bundle 9.0 9.0.21	Oct 5, 2026
No fix yet
Microsoft Windows Desktop Runtime - 8.0.25 (arm64) (Windows apps)	No fix yet	no-fix	n/a
Microsoft Windows Desktop Runtime - 8.0.25 (x64) (Windows apps)	No fix yet	no-fix	n/a
Microsoft Windows Desktop Runtime - 8.0.25 (x86) (Windows apps)	No fix yet	no-fix	n/a

Details

Published
October 13, 2026
Weakness
Heap-based Buffer Overflow
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105016

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