Windows DNS Server Remote Code Execution Vulnerability

Use after free in DNS Server allows an authorized attacker to execute code over a network.

Read the vendor bulletin Get alerts for Windows Server 2025 (Server Core installation)

8.0CVSS out of 10High severity

Scope

What the vendor says is affected

Windows Server 2025 (Server Core installation)
Windows Server 2025

Versions the vendor lists as fixed

10.0.26100.33158

Next step

What the vendor recommends

Install KB5099536.

Review the complete instructions on the vendor's site

Timeline

When this advisory changed

Jul 14, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Sep 2, 2026 at 11:20 PM UTC
Added to SecurityAlert
We collected the advisory from the official source.
Sep 3, 2026 at 5:25 AM UTC
Confirmed at the source
Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-49169View CVSS, KEV, EPSS, and threat context

Source

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Vendor: Microsoft Security Response Center
Advisory ID: CVE-2026-49169
Last source check: Sep 13, 2026 at 2:40 AM UTC

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Your environment

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Test the update or mitigation through your normal change process.

Watch Windows Server 2025 (Server Core installation)

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What the vendor says is affected

Versions the vendor lists as fixed

What the vendor recommends

When this advisory changed

CVEs named in this advisory

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