Wiz
Vulnerability DatabaseCVE-2026-25667

CVE-2026-25667: 
.NET SDK vulnerability analysis and mitigation

ASP.NET Core Kestrel in Microsoft .NET 8.0 before 8.0.22 and .NET 9.0 before 9.0.11 allows a remote attacker to cause excessive CPU consumption by sending a crafted QUIC packet, because of an incorrect exit condition for HTTP/3 Encoder/Decoder stream processing.

Source: NVD

Related .NET SDK vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-26131HIGH7.8
  • C#C#
  • dotnet-sdk-10.0
NoYesMar 10, 2026
CVE-2026-25667HIGH7.5
  • .NET SDK.NET SDK
  • dotnet-9
NoYesMar 19, 2026
CVE-2026-26127HIGH7.5
  • C#C#
  • dotnet-runtime-dbg-9.0
NoYesMar 10, 2026
CVE-2026-21218HIGH7.5
  • C#C#
  • cpe:2.3:a:microsoft:.net
NoYesFeb 10, 2026
CVE-2025-55248MEDIUM5.7
  • C#C#
  • dotnet9
NoYesOct 14, 2025

Free Vulnerability Assessment

Benchmark your Cloud Security Posture

Evaluate your cloud security practices across 9 security domains to benchmark your risk level and identify gaps in your defenses.

Request assessment

Additional Wiz resources

Cloud Vulnerability DB

Cloud Vulnerability DB

A community-led vulnerabilities database

Cloud Threat Landscape

Cloud Threat Landscape

A threat intelligence database

PEACH

PEACH

A tenant isolation framework

Get a personalized demo

Ready to see Wiz in action?

"Best User Experience I have ever seen, provides full visibility to cloud workloads."
David EstlickCISO
"Wiz provides a single pane of glass to see what is going on in our cloud environments."
Adam FletcherChief Security Officer
"We know that if Wiz identifies something as critical, it actually is."
Greg PoniatowskiHead of Threat and Vulnerability Management
Get a demo