CVE-2026-69304: ASP.NET Core Denial of Service Vulnerability

Medium severity · published Sep 8, 2026

CVE-2026-69304

ASP.NET Core Denial of Service Vulnerability

5.9

CVSS

0.9%

EPSS

On KEV

Description

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

CVSS vector

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

Attack vector

Network

Complexity

High

Privileges

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.9% · higher than 58% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

.NET 10.0 · Microsoft

10.0.0 before 10.0.12 · source: vendor

.NET 8.0 · Microsoft

8.0.0 before 8.0.31 · source: vendor

.NET 9.0 · Microsoft

9.0.0 before 9.0.20 · source: vendor

ASP.NET Core 10.0 · Microsoft

10.0 before 10.0.12 · source: vendor

ASP.NET Core 11.0 · Microsoft

11.0 before 11.0 RC1 · source: vendor

ASP.NET Core 8.0 · Microsoft

8.0 before 8.0.31 · source: vendor

ASP.NET Core 9.0 · Microsoft

9.0 before 9.0.20 · source: vendor

Microsoft Visual Studio 2022 version 17.14 · Microsoft

17.14.0 before 17.14.40 · source: vendor

Microsoft Visual Studio 2026 version 18.9 · Microsoft

18.9.0 before 18.9.3 · source: vendor

.net · Microsoft

8.0.0 before 8.0.31; 9.0.0 before 9.0.20; 10.0.0 before 10.0.12 · source: NVD

Asp.net Core · Microsoft

8.0.0 before 8.0.28; 9.0.0 before 9.0.17; 10.0.0 before 10.0.9; after 11.0.0 and later; 11.0 · source: NVD

Visual Studio 2022 · Microsoft

17.14.0 before 17.14.40 · source: NVD

Affected product

.NET 10.0

Microsoft

All .NET 10.0 CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-69304

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-69304

vendor-advisory

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304