CVE-2026-70188 (GCVE-0-2026-70188)

Vulnerability from cvelistv5 – Published: 2026-10-13 19:00 – Updated: 2026-10-14 17:53
VLAI
Title
ASP.NET Core Security Feature Bypass Vulnerability
Summary
Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 00:00 UTC
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
microsoft CNA under the mitre root
CNA scorecard B 82/100 over 3924 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Microsoft ASP.NET Core 10.0 Affected: 10.0 , < 10.0.13 (custom)
guessed Create a notification for this product.
Microsoft ASP.NET Core 11.0 Affected: 11.0 , < 11.0.0-rc.2 (custom)
guessed Create a notification for this product.
Microsoft ASP.NET Core 8.0 Affected: 8.0 , < 8.0.32 (custom)
guessed Create a notification for this product.
Microsoft ASP.NET Core 9.0 Affected: 9.0 , < 9.0.21 (custom)
guessed Create a notification for this product.
Microsoft Microsoft Visual Studio 2022 version 17.14 Affected: 17.14.0 , < 17.14.42 (custom)
guessed Create a notification for this product.
Microsoft Microsoft Visual Studio 2026 version 18.10 Affected: 18.10.0 , < 18.10.4 (custom)
guessed Create a notification for this product.
Date Public
2026-10-13 14:00
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-70188",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-08T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-14T03:56:54.567Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "ASP.NET Core 10.0",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.13",
              "status": "affected",
              "version": "10.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "ASP.NET Core 11.0",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "11.0.0-rc.2",
              "status": "affected",
              "version": "11.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "ASP.NET Core 8.0",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "8.0.32",
              "status": "affected",
              "version": "8.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "ASP.NET Core 9.0",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "9.0.21",
              "status": "affected",
              "version": "9.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Microsoft Visual Studio 2022 version 17.14",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "17.14.42",
              "status": "affected",
              "version": "17.14.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Microsoft Visual Studio 2026 version 18.10",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "18.10.4",
              "status": "affected",
              "version": "18.10.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:microsoft:microsoft_visual_studio_2026_version_18.10:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "18.10.4",
                  "versionStartIncluding": "18.10.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "17.14.42",
                  "versionStartIncluding": "17.14.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "11.0.0-rc.2",
                  "versionStartIncluding": "11.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "9.0.21",
                  "versionStartIncluding": "9.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.0.13",
                  "versionStartIncluding": "10.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "8.0.32",
                  "versionStartIncluding": "8.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2026-10-13T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Inconsistent interpretation of http requests (\u0027http request/response smuggling\u0027) in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-444",
              "description": "CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-14T17:53:41.661Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": "ASP.NET Core Security Feature Bypass Vulnerability",
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70188"
        }
      ],
      "title": "ASP.NET Core Security Feature Bypass Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
    "cveId": "CVE-2026-70188",
    "datePublished": "2026-10-13T19:00:26.806Z",
    "dateReserved": "2026-08-03T23:48:30.860Z",
    "dateUpdated": "2026-10-14T17:53:41.661Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-70188",
      "date": "2026-10-14",
      "epss": "0.00827",
      "percentile": "0.5655"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "ASP.NET Core 10.0",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.13",
                    "status": "affected",
                    "version": "10.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "product": "ASP.NET Core 11.0",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "11.0.0-rc.2",
                    "status": "affected",
                    "version": "11.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "product": "ASP.NET Core 8.0",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "8.0.32",
                    "status": "affected",
                    "version": "8.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "product": "ASP.NET Core 9.0",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "9.0.21",
                    "status": "affected",
                    "version": "9.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "product": "Microsoft Visual Studio 2022 version 17.14",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "17.14.42",
                    "status": "affected",
                    "version": "17.14.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "product": "Microsoft Visual Studio 2026 version 18.10",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "18.10.4",
                    "status": "affected",
                    "version": "18.10.0",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "secure@microsoft.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Inconsistent interpretation of http requests (\u0027http request/response smuggling\u0027) in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network."
          }
        ],
        "id": "CVE-2026-70188",
        "lastModified": "2026-10-14T04:18:33.003",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 9.1,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.2,
              "source": "secure@microsoft.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-70188",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-08T00:00:00+00:00",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-10-13T19:19:33.130",
        "references": [
          {
            "source": "secure@microsoft.com",
            "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70188"
          }
        ],
        "sourceIdentifier": "secure@microsoft.com",
        "vulnStatus": "Awaiting Analysis",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-444"
              }
            ],
            "source": "secure@microsoft.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-70188",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-13T20:53:07.923625Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-13T20:53:08.747Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "ASP.NET Core 10.0",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.13",
                  "status": "affected",
                  "version": "10.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "ASP.NET Core 11.0",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "11.0.0-rc.2",
                  "status": "affected",
                  "version": "11.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "ASP.NET Core 8.0",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "8.0.32",
                  "status": "affected",
                  "version": "8.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "ASP.NET Core 9.0",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "9.0.21",
                  "status": "affected",
                  "version": "9.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "Microsoft Visual Studio 2022 version 17.14",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "17.14.42",
                  "status": "affected",
                  "version": "17.14.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "Microsoft Visual Studio 2026 version 18.10",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "18.10.4",
                  "status": "affected",
                  "version": "18.10.0",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:a:microsoft:microsoft_visual_studio_2026_version_18.10:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "18.10.4",
                      "versionStartIncluding": "18.10.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "17.14.42",
                      "versionStartIncluding": "17.14.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "11.0.0-rc.2",
                      "versionStartIncluding": "11.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "9.0.21",
                      "versionStartIncluding": "9.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "10.0.13",
                      "versionStartIncluding": "10.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "8.0.32",
                      "versionStartIncluding": "8.0",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "datePublic": "2026-10-13T14:00:00.000Z",
          "descriptions": [
            {
              "lang": "en-US",
              "value": "Inconsistent interpretation of http requests (\u0027http request/response smuggling\u0027) in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 9.1,
                "baseSeverity": "CRITICAL",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en-US",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-444",
                  "description": "CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
                  "lang": "en-US",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-14T16:25:04.451Z",
            "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
            "shortName": "microsoft"
          },
          "references": [
            {
              "name": "ASP.NET Core Security Feature Bypass Vulnerability",
              "tags": [
                "vendor-advisory",
                "patch"
              ],
              "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70188"
            }
          ],
          "title": "ASP.NET Core Security Feature Bypass Vulnerability"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "assignerShortName": "microsoft",
        "cveId": "CVE-2026-70188",
        "datePublished": "2026-10-13T19:00:26.806Z",
        "dateReserved": "2026-08-03T23:48:30.860Z",
        "dateUpdated": "2026-10-14T16:25:04.451Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.