CVE-2026-45591: Microsoft .net

High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.

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

Affected products

• Microsoft .net: from 8.0.0, before 8.0.28 (fixed in 8.0.28); from 9.0.0, before 9.0.17 (fixed in 9.0.17); from 10.0.0, before 10.0.9 (fixed in 10.0.9)
• Microsoft ASP.NET Core: from 8.0.0, before 8.0.28 (fixed in 8.0.28); from 9.0.0, before 9.0.17 (fixed in 9.0.17); from 10.0.0, before 10.0.9 (fixed in 10.0.9)
• Microsoft Visual Studio 2026: from 18.6.0, before 18.6.3 (fixed in 18.6.3)

Published 2026-06-09. Last modified 2026-07-23.