CVE intelligence

CVE-2026-109478

Vulnerability intelligence

Published Nov 10, 2026Sources checked Nov 10, 2026

7.5HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-109478 and is rated High severity with a CVSS score of 7.5. 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: Nov 10, 2026

Vendor remediation details

Release Notes Install KB5135243.

Vendor-listed releases

8.0.34
17.14.45
18.11.4
18.12.0

CISA KEVNot listedBased on the latest collected catalog

EPSSUnavailableNo current score collected

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-109478?

Inefficient algorithmic complexity in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Source: NVD