CVE-2026-105016

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Heap-based Buffer Overflow in Microsoft QUIC

Publication date: 2026-10-13

Last updated on: 2026-10-22

Assigner: Microsoft Corporation

Description

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

CVSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-22

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-105016

EUVD

EUVD-2026-100459

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	.NET 10.0	10.0.0
Microsoft	.NET 11.0	11.0.0
Microsoft	.NET 8.0	8.0.0
Microsoft	.NET 9.0	9.0.0
Microsoft	Microsoft Visual Studio 2022 version 17.14	17.14.0
Microsoft	Microsoft Visual Studio 2026 version 18.10	18.10.0
Microsoft	Windows 11 version 23H2	10.0.22631.0
Microsoft	Windows 11 Version 23H2	10.0.22631.0
Microsoft	Windows 11 Version 24H2	10.0.26100.0
Microsoft	Windows 11 Version 25H2	10.0.26200.0
Microsoft	Windows 11 version 26H1	10.0.28000.0
Microsoft	Windows 11 Version 26H2	10.0.26300.0
Microsoft	Windows Server 2022	10.0.20348.0
Microsoft	Windows Server 2025	10.0.26100.0
Microsoft	Windows Server 2025 (Server Core installation)	10.0.26100.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This is a heap-based buffer overflow in Microsoft QUIC, a protocol for internet communication. It allows an unauthorized attacker to execute arbitrary code over a network by exploiting memory corruption in the heap region.

Impact Analysis

An attacker could exploit this to run malicious code on your system remotely without authentication. This could lead to data theft, system compromise, or further network attacks if you use affected Microsoft products like Windows or .NET.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR (data protection) and HIPAA (health data privacy). Organizations may face fines or legal consequences if they fail to patch systems promptly.

Mitigation Strategies

Apply the latest security updates from Microsoft for QUIC and related components. Monitor Microsoft's update guide for patches and disable QUIC if not required until patched.

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