September 27, 2026
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CVE-2026-62815

Critical9.8Published on August 11, 2026

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

CVSS score9.8 / 10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)CWE-416
Vendorsmicrosoft

Affected products

VendorsProductVersions
microsoftwindows 11 23h2< 10.0.22631.7517
microsoftwindows 11 24h2< 10.0.26100.9106
microsoftwindows 11 25h2< 10.0.26200.9106
microsoftwindows 11 26h1< 10.0.28000.2704
microsoftwindows server 2022< 10.0.20348.5440
microsoftwindows server 2025< 10.0.26100.33222

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