CVE intelligence

CVE-2026-62817

Vulnerability intelligence

Published Aug 11, 2026Sources checked Oct 28, 2026

8.8HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-62817 and is rated High severity with a CVSS score of 8.8. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Sep 8, 2026

Vendor remediation details

Install KB5120238. Install KB5120242. Install KB5120229. Install KB5120233. Install KB5120228.

Vendor-listed releases

10.0.17763.9121
10.0.20348.5499
10.0.20348.5440
10.0.26100.33296
10.0.26100.33222

CISA KEVNot listedBased on the latest collected catalog

EPSS0.5%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-62817?

Out-of-bounds write in Windows DNS allows an unauthorized attacker to execute code over an adjacent network.

Source: NVD