CVE-2026-45591Important

ASP.NET Core Denial of Service Vulnerability

MSRC advisory NVD CVE.org

Assessment

Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Severity: Important
CVSS base score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
Impact: Denial of Service
EPSS, next 30 days: 2.4%Higher than 83.7% of scored CVEs · FIRST model run 29 Sep 2026 · about EPSS
Public exploit code: No Nuclei template lists it
Exploitability: Exploitation Less Likely
Publicly disclosed: No
Customer action: Required: apply the update
Component: ASP.NET Core
Weakness: CWE-400: Uncontrolled Resource Consumption
Issued by: Microsoft
Published: 9 Jun 2026 · June 2026
Last revised: 9 Jun 2026

3 KBs

KB	Type	Restart	Applies to	Other CVEs
KB5097148	Security Update	—	.NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows and 1 more	All CVEs in KB5097148
KB5097149	Security Update	—	.NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS, .NET 8.0 installed on Windows and 1 more	All CVEs in KB5097149
KB5097150	Security Update	—	.NET 9.0 installed on Linux, .NET 9.0 installed on Mac OS, .NET 9.0 installed on Windows and 1 more	All CVEs in KB5097150

Developer Tools

13 affected products