Vulnerability DatabaseCVE-2026-25667
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CVE-2026-25667
Published:March 19, 2026
Updated:April 23, 2026
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.
Affected Packages
https://github.com/dotnet/aspnetcore.git (GITHUB):
Affected version(s) >=v9.0.0 <v9.0.11
Fix Suggestion:
Update to version v9.0.11
https://github.com/dotnet/aspnetcore.git (GITHUB):
Affected version(s) >=v8.0.0 <v8.0.22
Fix Suggestion:
Update to version v8.0.22
Microsoft.AspNetCore.Server.Kestrel.Core (NUGET):
Affected version(s) >=2.0.0 <2.3.6
Fix Suggestion:
Update to version 2.3.6
Related Resources (3)
https://github.com/IsaJafarov/Kestrel-DoS
https://github.com/IsaJafarov/Q3Fuzz
https://github.com/dotnet/aspnetcore/commit/96ccc40a0e095424b19506e8268b9b1a3e23d6a7#diff-667d5b3693f93a0f706ab211428998b210862f9b885d917104d2013118312626
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Uncontrolled Resource Consumption
CWE-400
EPSS
Base Score:
0.14