High · 7.5 CVE-2026-25667 EUVD-2026-13148GHSA-jc8w-j2q2-vwjx

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 consump…

Published Mar 19, 2026 · Updated Apr 29, 2026 · Assigned by mitre

Description

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.

References

https://github.com/IsaJafarov/Kestrel-DoS
https://github.com/dotnet/aspnetcore/commit/96ccc40a0e095424b19506e8268b9b1a3e23d6a7#diff-667d5b3693f93a0f706ab211428998b210862f9b885d917104d2013118312626
https://github.com/IsaJafarov/Q3Fuzz