CVE-2026-25667

CVE Database · CVE-2026-25667

CVE-2026-25667

· HIGHModified

CVSS v3.1

7.5

EPSS

3.00%

Published

Mar 19, 2026

Modified

Apr 22, 2026

Public PoC / Exploit

All weaponized →

No public PoC or exploit code indexed for this CVE.

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-400

Affected Products (2)

microsoft · .net (up to 8.0.22)vulnerable

microsoft · .net (up to 9.0.11)vulnerable

References (3)

https://github.com/IsaJafarov/Kestrel-DoS

ExploitThird Party Advisory

https://github.com/IsaJafarov/Q3Fuzz

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

Patch

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