9.8 Critical

CVE-2026-100219 Microsoft QUIC Remote Code Execution Vulnerability

Description

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

CVSS 3.1 detail

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

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Network
Attack complexity: Low
Privileges required: None
Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Affected products and versions

Product	Affected versions	Fixed in
Windows 11 Version 23H2 10.0	10.0.22631.0 → < 10.0.22631.7652	10.0.22631.7652
Windows 11 Version 24H2 10.0	10.0.26100.0 → < 10.0.26100.9711	10.0.26100.9711
Windows 11 Version 25H2 10.0	10.0.26200.0 → < 10.0.26200.9711	10.0.26200.9711
Windows 11 version 26H1 10.0	10.0.28000.0 → < 10.0.28000.3231	10.0.28000.3231
Windows 11 Version 26H2 10.0	10.0.26300.0 → < 10.0.26300.9711	10.0.26300.9711
Windows Server 2022 10.0	10.0.20348.0 → < 10.0.20348.5761	10.0.20348.5761
Windows Server 2025 10.0	10.0.26100.0 → < 10.0.26100.33650	10.0.26100.33650
Windows Server 2025 (Server Core installation) 10.0	10.0.26100.0 → < 10.0.26100.33650	10.0.26100.33650