CRITICAL 9.8 Microsoft

CVE-2026-62815

Microsoft QUIC Remote Code Execution Vulnerability

Microsoft Security Update 2026-Aug: Microsoft QUIC Remote Code Execution Vulnerability

Affected Products

Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2025 (Server Core installation)
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems

References

Published: 2026-08-11 · Source: Microsoft · Feed updated: 2026-08-11

This critical severity vulnerability with a CVSS score of 9.8 was published on 2026-08-11 via Microsoft. Affected: Windows Server 2022, Windows Server 2022 (Server Core installation), Windows Server 2025 (Server Core installation) and 5 more.

Risk Timeline

CVE Disclosed2026-08-11 · -1 days ago

Remediation Resources

Official Advisory

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

NVD / MITRE

nvd.nist.gov/vuln/detail/CVE-2026-62815

Related Vulnerabilities

CVE	Title	Severity	CVSS
CVE-2026-57092	Microsoft Windows VMSwitch Elevation of Privilege Vulnerability	CRITICAL	9.9
CVE-2026-59124	Microsoft High Performance Computing (HPC) Pack Remote Code Execution Vulnerabil	CRITICAL	9.8
CVE-2026-62878	Windows DNS Server Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-62893	Windows Deployment Services TFTP Server Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-65791	Windows iSCSI Target Service Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2025-21298 PoC	Windows OLE Remote Code Execution Vulnerability	CRITICAL	9.8

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