CVE intelligence

CVE-2026-42899

Vulnerability intelligence

Published May 12, 2026Sources checked Nov 11, 2026

7.5HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-42899 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: May 12, 2026

Install KB5093447. Install KB5093448. Install KB5093446.

Vendor-listed releases

8.0.27
9.0.16
10.0.8

CISA KEVNot listedBased on the latest collected catalog

EPSS2.4%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-42899?

Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Source: NVD