CVE-2026-62815

Published: Aug 11, 2026Modified: Aug 14, 2026

9.8

Vector

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

Exploitability: 3.9 / Impact: 5.9

Source: secure@microsoft.com (Secondary)

Description

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

Affected (10)

Products: Microsoft: Windows 11 23h2, Windows 11 24h2, Windows 11 25h2, Windows 11 26h1, Windows Server 2022, Windows Server 2025

6 products

Windows 11 23h2

Windows 11 24h2

Windows 11 25h2

Windows 11 26h1

Windows Server 2022

Windows Server 2025

Configuration A

10 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 11 23h2	version < 10.0.22631.7517
Microsoft Windows 11 23h2	version < 10.0.22631.7517
Microsoft Windows 11 24h2	version < 10.0.26100.9106
Microsoft Windows 11 24h2	version < 10.0.26100.9106
Microsoft Windows 11 25h2	version < 10.0.26200.9106
Microsoft Windows 11 25h2	version < 10.0.26200.9106
Microsoft Windows 11 26h1	version < 10.0.28000.2704
Microsoft Windows 11 26h1	version < 10.0.28000.2704
Microsoft Windows Server 2022	version < 10.0.20348.5440
Microsoft Windows Server 2025	version < 10.0.26100.33222

Related CWEs

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815

Source: secure@microsoft.com

Vendor AdvisoryPatch

Timeline

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