CVE-2026-70188

Status: Awaiting AnalysisCritical (9.1)—

Severity9.1Critical · CVSS 3.1

Exploitation probability0.83 %higher than 57% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitNot knownno public code found

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.

CVSS

Base score: 9.1
Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.83 %
Percentile among all scored CVEs: 57
Score date: 10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access85 %

Request smuggling por interpretación inconsistente de HTTP en ASP.NET Core, sin privilegios ni interacción por red; el texto solo indica bypass de una característica de seguridad, sin impacto concreto.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic Application Isolation and Sandboxing

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Microsoft — Asp.net Core^AI

CWEs

CWE-444

References

Show 1 references

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70188

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-70188",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-70188",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-08T00:00:00+00:00"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "secure@microsoft.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.1,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "ASP.NET Core 10.0",
          "versions": [
            {
              "status": "affected",
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            }
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        },
        {
          "vendor": "Microsoft",
          "product": "ASP.NET Core 11.0",
          "versions": [
            {
              "status": "affected",
              "version": "11.0",
              "lessThan": "11.0.0-rc.2",
              "versionType": "custom"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "ASP.NET Core 8.0",
          "versions": [
            {
              "status": "affected",
              "version": "8.0",
              "lessThan": "8.0.32",
              "versionType": "custom"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "ASP.NET Core 9.0",
          "versions": [
            {
              "status": "affected",
              "version": "9.0",
              "lessThan": "9.0.21",
              "versionType": "custom"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Visual Studio 2022 version 17.14",
          "versions": [
            {
              "status": "affected",
              "version": "17.14.0",
              "lessThan": "17.14.42",
              "versionType": "custom"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Visual Studio 2026 version 18.10",
          "versions": [
            {
              "status": "affected",
              "version": "18.10.0",
              "lessThan": "18.10.4",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-10-13T19:19:33.130",
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70188",
      "source": "secure@microsoft.com"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secure@microsoft.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-444"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "lastModified": "2026-10-14T04:18:33.003",
  "sourceIdentifier": "secure@microsoft.com"
}