---
id: GHSA-v3f6-m9j2-437p
title: >-
  Duplicate Advisory: Microsoft Security Advisory CVE-2026-69304 – ASP.NET Core
  Denial of Service Vulnerability
summary: >-
  Duplicate Advisory: Microsoft Security Advisory CVE-2026-69304 – ASP.NET Core
  Denial of Service Vulnerability
severity: medium
cvss: 5.9
cwe:
  - CWE-409
vendor: Microsoft
product: Microsoft.AspNetCore.Server.IISIntegration
ecosystem: nuget
affected:
  - >-
    Microsoft.AspNetCore.Server.IISIntegration >= 11.0.0-preview.1, <
    11.0.0-rc.1
  - 'Microsoft.AspNetCore.Server.IISIntegration >= 8.0.0, <= 8.0.30'
  - 'Microsoft.AspNetCore.Server.IISIntegration >= 9.0.0, <= 9.0.19'
  - 'Microsoft.AspNetCore.Server.IISIntegration >= 10.0.0, <= 10.0.11'
patched:
  - Microsoft.AspNetCore.Server.IISIntegration 11.0.0-rc.1
  - Microsoft.AspNetCore.Server.IISIntegration 8.0.31
  - Microsoft.AspNetCore.Server.IISIntegration 9.0.20
  - Microsoft.AspNetCore.Server.IISIntegration 10.0.12
published: '2026-09-08'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:14:34Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-v3f6-m9j2-437p'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-69304'
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304'
  - url: 'https://github.com/advisories/GHSA-v3f6-m9j2-437p'
tags:
  - ghsa
  - nuget
ingestedAt: '2026-09-08T22:12:30.968Z'
---

## Overview

### Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-8cp2-47hg-mfgh. This link is maintained to preserve external references.

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

## Affected packages

- `Microsoft.AspNetCore.Server.IISIntegration >= 11.0.0-preview.1, < 11.0.0-rc.1`
- `Microsoft.AspNetCore.Server.IISIntegration >= 8.0.0, <= 8.0.30`
- `Microsoft.AspNetCore.Server.IISIntegration >= 9.0.0, <= 9.0.19`
- `Microsoft.AspNetCore.Server.IISIntegration >= 10.0.0, <= 10.0.11`

## Remediation

Upgrade to a patched release:

- `Microsoft.AspNetCore.Server.IISIntegration 11.0.0-rc.1`
- `Microsoft.AspNetCore.Server.IISIntegration 8.0.31`
- `Microsoft.AspNetCore.Server.IISIntegration 9.0.20`
- `Microsoft.AspNetCore.Server.IISIntegration 10.0.12`