Integer underflow in Microsoft Windows and Windows Server - CVE-2026-105512

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Main Vulnerability Database Vulnerabilities #VU164646

Integer underflow in Microsoft Windows and Windows Server - CVE-2026-105512

Published: November 10, 2026


Vulnerability identifier: #VU164646
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-105512
CWE-ID: CWE-191
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to integer underflow in Microsoft QUIC when processing network traffic. A remote attacker can send specially crafted network traffic to trigger the underflow and cause a denial of service.


Affected software

Microsoft Windows
Windows Server

How to mitigate CVE-2026-105512

Install security update from vendor's website.

Microsoft Windows - addressed in versions 11 23H2 10.0.22631.7711, 11 24H2 10.0.26100.9911, 11 24H2 10.0.26100.9974, 11 25H2 10.0.26200.9911, 11 25H2 10.0.26200.9974, 11 26H1 10.0.28000.3501
Windows Server - addressed in versions 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822

External References