What is CVE-2026-69858?

CVE-2026-69858 is a high-severity vulnerability in Microsoft Windows Server 2022, classified under Use After Free. CVSS score: 8.1/10. Published 2026-09-08.

How severe is CVE-2026-69858?

High severity. CVSS v3 base score is 8.1 out of 10.

Use After Free in Microsoft Windows Server 2022

CVE-2026-69858

Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.

Vulnerability class: Use-After-Free

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Microsoft Windows Server 2022
Microsoft Windows Server 2025
Microsoft Windows Server 2025 (Server Core Installation)

Weakness classification (CWE)

CWE-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2026-69858?: CVE-2026-69858 is a high-severity vulnerability in Microsoft Windows Server 2022, classified under Use After Free. CVSS score: 8.1/10. Published 2026-09-08.
How severe is CVE-2026-69858?: High severity. CVSS v3 base score is 8.1 out of 10.