FKIE_CVE-2026-69304
Vulnerability from fkie_nvd - Published: 2026-09-08 18:18 - Updated: 2026-09-30 20:49
Severity
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9 (Medium) - CVSS:3.1/
Summary
Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.
References
| URL | Tags | ||
|---|---|---|---|
| secure@microsoft.com | https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304 | Patch, Vendor Advisory |
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| microsoft | asp.net_core | * | |
| microsoft | asp.net_core | * | |
| microsoft | asp.net_core | * | |
| microsoft | asp.net_core | * | |
| microsoft | asp.net_core | 11.0 | |
| microsoft | visual_studio_2022 | * | |
| microsoft | visual_studio_2026 | * | |
| microsoft | .net | * | |
| microsoft | .net | * | |
| microsoft | .net | * | |
| microsoft | windows | - |
{
"affected": [
{
"affectedData": [
{
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"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.12",
"status": "affected",
"version": "10.0.0",
"versionType": "custom"
}
]
},
{
"product": ".NET 8.0",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "8.0.31",
"status": "affected",
"version": "8.0.0",
"versionType": "custom"
}
]
},
{
"product": ".NET 9.0",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "9.0.20",
"status": "affected",
"version": "9.0.0",
"versionType": "custom"
}
]
},
{
"product": "ASP.NET Core 10.0",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.12",
"status": "affected",
"version": "10.0",
"versionType": "custom"
}
]
},
{
"product": "ASP.NET Core 11.0",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "11.0 RC1",
"status": "affected",
"version": "11.0",
"versionType": "custom"
}
]
},
{
"product": "ASP.NET Core 8.0",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "8.0.31",
"status": "affected",
"version": "8.0",
"versionType": "custom"
}
]
},
{
"product": "ASP.NET Core 9.0",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "9.0.20",
"status": "affected",
"version": "9.0",
"versionType": "custom"
}
]
},
{
"product": "Microsoft Visual Studio 2022 version 17.14",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "17.14.40",
"status": "affected",
"version": "17.14.0",
"versionType": "custom"
}
]
},
{
"product": "Microsoft Visual Studio 2026 version 18.9",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "18.9.3",
"status": "affected",
"version": "18.9.0",
"versionType": "custom"
}
]
}
],
"source": "secure@microsoft.com"
}
],
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network."
}
],
"id": "CVE-2026-69304",
"lastModified": "2026-09-30T20:49:06.713",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
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},
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{
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"impactScore": 3.6,
"source": "nvd@nist.gov",
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{
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{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-08T19:33:58.502592Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-08T18:18:46.347",
"references": [
{
"source": "secure@microsoft.com",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304"
}
],
"sourceIdentifier": "secure@microsoft.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-409"
}
],
"source": "secure@microsoft.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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