CVE intelligence

CVE-2026-69439

Vulnerability intelligence

Published Sep 8, 2026Sources checked Oct 28, 2026

8.8HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-69439 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 25, 2026

Vendor remediation details

Release Notes Install KB5126106. Install KB5126104. Install KB5126105.

Vendor-listed releases

10.0.12
8.0.31
9.0.20
17.14.40
18.9.3
11.0 RC1

CISA KEVNot listedBased on the latest collected catalog

EPSS0.8%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-69439?

Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.

Source: NVD