CVE-2026-105016: Microsoft QUIC Remote Code Execution Vulnerability

Overview

Severity

Critical (CVSS 9.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Oct

Released

2026-10-13

Description

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

FAQ

How could an attacker exploit this vulnerability? An unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system. No authentication or user interaction is required..

Affected Products (20)

Windows

• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 24H2 for x64-based Systems
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 26H2 for ARM64-based Systems
• Windows 11 Version 26H2 for x64-based Systems
• Windows Server 2025
• Windows Server 2025 (Server Core installation)
• Windows 11 Version 26H1 for ARM64-based Systems
• Windows 11 version 26H1 for x64-based Systems

Developer Tools

• Microsoft Visual Studio 2026 version 18.10
• Microsoft Visual Studio 2022 version 17.14
• .NET 8.0 installed on Windows
• .NET 9.0 installed on Windows
• .NET 10.0 installed on Windows
• .NET 11.0 installed on Windows

Security Updates (9)

• 5126655
• 5126653
• 5127648
• 5126646
• 5127646
• Release Notes
• Release Notes
• Release Notes
• Release Notes

Acknowledgments

pwn2addr

Revision History

• 2026-10-13: Information published.