CVE-2026-57099 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: Sep 22, 2026
Release Notes
Vendor-listed releases
7.8.1
CISA KEVNot listedBased on the latest collected catalog
EPSS1.2%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-57099?
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.