Recorded 27 Oct 2026 at 15:48 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position.
See the latest record.
The historical field “Public exploit code” recorded Nuclei detection-template membership. It did not establish exploit availability. The original recorded fields remain below.
The historical “Publicly disclosed: No” field could represent a missing MSRC assessment. It does not establish that the vulnerability was undisclosed. The original recorded fields remain below.
CVEMicrosoft Security Response Center
ASP.NET Core Denial of Service Vulnerability
Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.
CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)
Issued by
Microsoft
Customer action
Required: apply the update
Affected products
.NET 10.0 installed on Windows, .NET 8.0 installed on Windows, .NET 9.0 installed on Windows, ASP.NET Core 10.0, ASP.NET Core 11.0, ASP.NET Core 8.0, ASP.NET Core 9.0, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.9
Updates that fix it
KB5126104: .NET 8.0 installed on Windows, ASP.NET Core 8.0 (restart required); KB5126105: .NET 9.0 installed on Windows, ASP.NET Core 9.0 (restart required); KB5126106: .NET 10.0 installed on Windows, ASP.NET Core 10.0 (restart required)
CISA KEV
Not listed in the collected catalog
EPSS
0.9%; scored 27 Oct 2026
Public exploit code
No Nuclei template listed
Published
8 Sep 2026 07:00 UTC
Last revised
25 Sep 2026 07:00 UTC
Revision note
Security Updates table updated provide links to the KB articles and download center updates. Microsoft recommends installing the updates.
Complete at observationRead 27 Oct 2026 at 15:46 UTC
CISA KEV
Complete at observationRead 27 Oct 2026 at 15:46 UTC
FIRST EPSS
Complete at observationRead 27 Oct 2026 at 15:46 UTC
Public detection templates (Nuclei)
Complete at observationRead 27 Oct 2026 at 15:46 UTC
Coverage describes the sources at this observation. A complete read then does not establish their current position.
What changed
Detection template: Unknown: exploit-code evidence is incomplete or retained → No Nuclei template listed · CISA KEV: Unknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
Detection template: No Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained · CISA KEV: Not listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
Page history
Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.