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Duplicate Advisory: Microsoft Security Advisory CVE-2026-69304 – ASP.NET Core Denial of Service Vulnerability

Moderate severity GitHub Reviewed Published Sep 8, 2026 to the GitHub Advisory Database • Updated Sep 8, 2026
Withdrawn This advisory was withdrawn on Sep 8, 2026

Package

nuget Microsoft.AspNetCore.Server.IISIntegration (NuGet)

Affected versions

>= 11.0.0-preview.1, < 11.0.0-rc.1
>= 8.0.0, <= 8.0.30
>= 9.0.0, <= 9.0.19
>= 10.0.0, <= 10.0.11

Patched versions

11.0.0-rc.1
8.0.31
9.0.20
10.0.12

Description

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This advisory has been withdrawn because it is a duplicate of GHSA-8cp2-47hg-mfgh.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.

References

Published by the National Vulnerability Database Sep 8, 2026
Published to the GitHub Advisory Database Sep 8, 2026
Reviewed Sep 8, 2026
Withdrawn Sep 8, 2026
Last updated Sep 8, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

Weaknesses

Improper Handling of Highly Compressed Data (Data Amplification)

The product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output. Learn more on MITRE.

CVE ID

No known CVE

GHSA ID

GHSA-v3f6-m9j2-437p

Source code

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