CVE-2026-69304: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) in Microsoft .NET 10.0
Description
CVE-2026-69304 is a medium severity vulnerability in Microsoft .NET 10.0 and related versions involving improper handling of highly compressed data in ASP.NET Core. This flaw can be exploited by an unauthorized attacker to cause a denial of service (DoS) over a network. The vulnerability is identified as CWE-409, related to data amplification issues. An official fix is available from Microsoft.
CVSS v3.1
Score 5.9medium
Affected software
Microsoft
.NET 10.0
Microsoft
.NET 8.0
Microsoft
.NET 9.0
Microsoft
ASP.NET Core 10.0
Microsoft
ASP.NET Core 11.0
Microsoft
ASP.NET Core 8.0
Microsoft
ASP.NET Core 9.0
Microsoft
Microsoft Visual Studio 2022 version 17.14
Microsoft
Microsoft Visual Studio 2026 version 18.9
pkg:nuget/microsoft.netRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-69304) affects Microsoft .NET versions including 8.0, 9.0, 10.0, 11.0, 17.14, and 18.9 within specified version ranges. It involves improper handling of highly compressed data in ASP.NET Core, which can lead to data amplification and enable an attacker to cause a denial of service condition remotely without authentication. The CVSS v3.1 base score is 5.9 (medium severity), with network attack vector, high attack complexity, no privileges or user interaction required, and impacts availability only. Microsoft has published an official fix for this vulnerability.
Potential Impact
An unauthorized attacker can exploit this vulnerability to cause denial of service over a network by leveraging improper handling of highly compressed data, resulting in resource exhaustion or service disruption. There is no impact on confidentiality or integrity.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft for the affected .NET versions as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304. No additional mitigation actions are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T20:46:07.440Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304","vendor":"Microsoft"}]
Threat ID: 6aa044e2acd9273b49fa7dfb
Added to database: 09/08/2026, 17:24:50 UTC
Last enriched: 10/16/2026, 20:40:32 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 55
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.