What is CVE-2026-69858?

CVE-2026-69858 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Windows DNS Server Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-69858 cover?

CVE-2026-69858 covers the following CVE IDs: CVE-2026-69858. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-69858?

CVE-2026-69858 has a CVSS v3 base score of 8.1, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-69858?

CVE-2026-69858 affects 4 products, including: Windows Server 2022; Windows Server 2022 (Server Core installation); Windows Server 2025; Windows Server 2025 (Server Core installation).

CVE-2026-69858CriticalCVSS 8.1

Windows DNS Server Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

September 11, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-69858 →

📋 Description

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

🎯 Affected products4

Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2025
Windows Server 2025 (Server Core installation)

✅ Remediation

KB5122882 (Security Update) — fixed build 10.0.20348.5622 KB5122871 (Security Update) — fixed build 10.0.26100.33438

🔗 References (5)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69858
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5122882
referencehttps://support.microsoft.com/help/5122882
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5122871
referencehttps://support.microsoft.com/help/5122871