CVE-2026-25667

7.5 HIGH

Published: March 19, 2026 Modified: April 14, 2026

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

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

Source: cve@mitre.org

Exploit Third Party Advisory

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

Source: cve@mitre.org

Patch

2 reference(s) from NVD

Quick Stats

CVSS v3 Score

7.5 / 10.0

EPSS (Exploit Probability)

2.4%

85th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-400

Affected Vendors

microsoft

Related CVEs

CVE-2026-6579 6.5

CVE-2026-6578 5.6

CVE-2026-6577 7.3

CVE-2026-6576 6.3

CVE-2026-6574 7.3