GHSA-v3f6-m9j2-437p: Duplicate Advisory Denial of Service Vulnerability
MODERATEGHSA-v3f6-m9j2-437p is a MODERATE (CVSS 5.9) denial of service vulnerability (CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)) affecting Duplicate Advisory libraries in the NuGet ecosystem. The issue involves microsoft security advisory cve-2026-69304 – asp.net core denial of service vulnerability. Remediation is available by upgrading affected packages to version 11.0.0-rc.1, 8.0.31, 9.0.20, 10.0.12.
GHSA-v3f6-m9j2-437p at a Glance
Security Impact
CVSS: 5.9
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
How to Fix GHSA-v3f6-m9j2-437p
To remediate this vulnerability, upgrade all affected Duplicate Advisory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade Microsoft.AspNetCore.Server.IISIntegration to 11.0.0-rc.1Upgrade Microsoft.AspNetCore.Server.IISIntegration to 8.0.31Upgrade Microsoft.AspNetCore.Server.IISIntegration to 9.0.20Upgrade Microsoft.AspNetCore.Server.IISIntegration to 10.0.12Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for Microsoft.AspNetCore.Server.IISIntegrationHow to Check if You Are Affected
To determine whether your application is affected by GHSA-v3f6-m9j2-437p, inspect your project dependencies for Duplicate Advisory:
inspect dependencies for Microsoft.AspNetCore.Server.IISIntegrationAnalyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 11.0.0-rc.1), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-409: Improper Handling of Highly Compressed Data (Data Amplification), where the product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output. In Duplicate Advisory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
GHSA-v3f6-m9j2-437p Affected Duplicate Advisory Versions
4 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
Microsoft.AspNetCore.Server.IISIntegration
|
NuGet |
≥ 11.0.0-preview.1
< 11.0.0-rc.1
|
11.0.0-rc.1
|
|
Microsoft.AspNetCore.Server.IISIntegration
|
NuGet |
≥ 8.0.0
< 8.0.31
|
8.0.31
|
|
Microsoft.AspNetCore.Server.IISIntegration
|
NuGet |
≥ 9.0.0
< 9.0.20
|
9.0.20
|
|
Microsoft.AspNetCore.Server.IISIntegration
|
NuGet |
≥ 10.0.0
< 10.0.12
|
10.0.12
|
References
Frequently Asked Questions
What is GHSA-v3f6-m9j2-437p?
Which Duplicate Advisory versions are affected?
What version fixes GHSA-v3f6-m9j2-437p?
Is Microsoft.AspNetCore.Server.IISIntegration affected?
What is the CVSS score of GHSA-v3f6-m9j2-437p?
What CWE is associated with GHSA-v3f6-m9j2-437p?
How can I check NuGet dependencies for GHSA-v3f6-m9j2-437p?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-v3f6-m9j2-437p",
"modified" : "2026-09-08T21:14:33Z",
"published" : "2026-09-08T18:32:21Z",
"withdrawn" : "2026-09-08T21:14:33Z",
"aliases" : [ ],
"summary" : "Duplicate Advisory: Microsoft Security Advisory CVE-2026-69304 – ASP.NET Core Denial of Service Vulnerability",
"details" : "### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-8cp2-47hg-mfgh. This link is maintained to preserve external references.\n\n### Original Description\nImproper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "NuGet",
"name" : "Microsoft.AspNetCore.Server.IISIntegration"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "11.0.0-preview.1"
}, {
"fixed" : "11.0.0-rc.1"
} ]
} ]
}, {
"package" : {
"ecosystem" : "NuGet",
"name" : "Microsoft.AspNetCore.Server.IISIntegration"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "8.0.0"
}, {
"fixed" : "8.0.31"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 8.0.30"
}
}, {
"package" : {
"ecosystem" : "NuGet",
"name" : "Microsoft.AspNetCore.Server.IISIntegration"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "9.0.0"
}, {
"fixed" : "9.0.20"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 9.0.19"
}
}, {
"package" : {
"ecosystem" : "NuGet",
"name" : "Microsoft.AspNetCore.Server.IISIntegration"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.0.0"
}, {
"fixed" : "10.0.12"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 10.0.11"
}
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-69304"
}, {
"type" : "WEB",
"url" : "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304"
}, {
"type" : "PACKAGE",
"url" : "https://www.nuget.org/packages/Microsoft.AspNetCore.Server.IISIntegration"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-409" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-09-08T21:14:33Z",
"nvd_published_at" : "2026-09-08T18:18:46Z"
}
}