CVE-2026-118749: ASP.NET Core Denial of Service Vulnerability
Published Nov 10, 2026
·Updated
ASP.NET Core Denial of Service Vulnerability
Other sources
Inefficient algorithmic complexity in ASP.NET Core allows an unauthorized attacker to deny service over a network.
— Microsoft
Affected Software
8 affected componentsFixes available
All of the following
Microsoft .NET>=11.0<11.0.0
11.0.0
Linux Linux*
Microsoft Visual Studio 2026>=18.12<18.12.0
18.12.0
All of the following
Microsoft .NET>=11.0<11.0.0
11.0.0
Microsoft Windows*
All of the following
Microsoft .NET>=11.0<11.0.0
11.0.0
Apple macOS*
Microsoft Microsoft.Extensions.Validation<11.0.0
11.0.0
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 11.0.0 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 18.12.0
Event History
Nov 10, 2026
CVE Published
via Microsoft·04:00 PM
Data Sourced
via Microsoft·04:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·06:21 PM
Data Sourced
via MITRE·06:21 PM
DescriptionSeverity
Data Sourced
via NVD·07:19 PM
DescriptionSeverityWeakness
Frequently Asked Questions
1
Does exploitation require authentication, user interaction, or local access?
No. The vector indicates network-based exploitation with no privileges required and no user interaction.
2
What security properties are affected if exploitation succeeds?
The reported impact is limited to availability. The supplied scoring data indicates no confidentiality or integrity impact.
3
Which software is identified in the advisory data?
The affected software list includes Microsoft .NET, Microsoft Visual Studio 2026, and Microsoft.Extensions.Validation.