What is CVE-2026-45648?

CVE-2026-45648 is a high-severity vulnerability in Microsoft Windows Server 2022, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-06-09.

How severe is CVE-2026-45648?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Microsoft Windows Server 2022

CVE-2026-45648

Stack-based buffer overflow in Active Directory Domain Services allows an authorized attacker to execute code over a network.

Vulnerability class: Buffer Overflow

EPSS: 0.011 (62.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Microsoft Windows Server 2022 — versions 10.0.20348.0
Microsoft Windows_server_2022
Microsoft Windows Server 2025 — versions 10.0.26100.0
Microsoft Windows_server_2025
Microsoft Windows Server 2025 (Server Core Installation) — versions 10.0.26100.0

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-45648?: CVE-2026-45648 is a high-severity vulnerability in Microsoft Windows Server 2022, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-06-09.
How severe is CVE-2026-45648?: High severity. CVSS v3 base score is 8.8 out of 10.