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CVE-2026-45591: ASP.NET Core Denial of Service Vulnerability

highCVSS 7.5CVE-2026-45591
Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.

CSIRTS triage

vendor: Microsoftproduct: ASP.NET CoreDenial of service
What
Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Who is affected
Deployments of ASP.NET Core applications.
Urgency
Remediation is urgent due to the high severity and potential for denial of service.
Action
Implement the recommended patches for ASP.NET Core.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.5
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45591

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-45591coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for ASP.NET Core Denial

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center