Improper handling of highly compressed data in Microsoft products - CVE-2026-69304
Published: September 8, 2026
Vulnerability identifier: #VU147576
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-69304
CWE-ID: CWE-409
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper handling of highly compressed data (data amplification) in ASP.NET Core when processing highly compressed data. A remote attacker can send highly compressed data to cause a denial of service.
Affected software
.NET
Visual Studio
ASP.NET Core
Microsoft .NET Framework
Visual Studio
ASP.NET Core
Microsoft .NET Framework
How to mitigate CVE-2026-69304
Install security update from vendor's website.
.NET - addressed in versions 8.0.31, 9.0.20
Visual Studio - update to 17.14.40
ASP.NET Core - addressed in versions 8.0.31, 9.0.20
Microsoft .NET Framework - update to 10.0.12
Visual Studio - update to 17.14.40
ASP.NET Core - addressed in versions 8.0.31, 9.0.20
Microsoft .NET Framework - update to 10.0.12