CVE-2026-69304 (GCVE-0-2026-69304)

Vulnerability from cvelistv5 – Published: 2026-09-08 17:17 – Updated: 2026-10-01 22:59
VLAI
Title
ASP.NET Core Denial of Service Vulnerability
Summary
Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 19:33 UTC
CWE
  • CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
References
Date Public
2026-09-08 14:00
Show details on NVD website

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                      "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "9.0.20",
                      "versionStartIncluding": "9.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "10.0.12",
                      "versionStartIncluding": "10.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "8.0.31",
                      "versionStartIncluding": "8.0",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "datePublic": "2026-09-08T14:00:00.000Z",
          "descriptions": [
            {
              "lang": "en-US",
              "value": "Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 5.9,
                "baseSeverity": "MEDIUM",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en-US",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-409",
                  "description": "CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)",
                  "lang": "en-US",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-01T22:59:38.598Z",
            "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
            "shortName": "microsoft"
          },
          "references": [
            {
              "name": "ASP.NET Core Denial of Service Vulnerability",
              "tags": [
                "vendor-advisory",
                "patch"
              ],
              "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304"
            }
          ],
          "title": "ASP.NET Core Denial of Service Vulnerability"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "assignerShortName": "microsoft",
        "cveId": "CVE-2026-69304",
        "datePublished": "2026-09-08T17:17:47.686Z",
        "dateReserved": "2026-08-03T20:46:07.440Z",
        "dateUpdated": "2026-10-01T22:59:38.598Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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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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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