CVE-2026-69304

ASP.NET Core Denial of Service Vulnerability

State: Published
Severity: 5.9 Medium
Published: Sep 8, 2026
Updated: Oct 31, 2026
Reserved: Aug 3, 2026

Description

Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)

Affected Products

Product	Versions
.NET 10.0 runtimeMicrosoft	10.0.0 to before 10.0.12Affected
.NET 8.0 runtimeMicrosoft	8.0.0 to before 8.0.31Affected
.NET 9.0 runtimeMicrosoft	9.0.0 to before 9.0.20Affected
ASP.NET Core 10.0Microsoft	10.0 to before 10.0.12Affected
ASP.NET Core 11.0Microsoft	11.0 to before 11.0 RC1Affected
ASP.NET Core 8.0Microsoft	8.0 to before 8.0.31Affected
ASP.NET Core 9.0Microsoft	9.0 to before 9.0.20Affected
Microsoft Visual Studio 2022 version 17.14Microsoft	17.14.0 to before 17.14.40Affected
Microsoft Visual Studio 2026 version 18.9Microsoft	18.9.0 to before 18.9.3Affected

References

ASP.NET Core Denial of Service Vulnerabilityvendor-advisorypatch

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.