{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-70188", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-08-03T23:48:30.860Z", "datePublished": "2026-10-13T19:00:26.806Z", "dateUpdated": "2026-10-13T19:16:50.310Z"}, "containers": {"cna": {"title": "ASP.NET Core Security Feature Bypass Vulnerability", "datePublic": "2026-10-13T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:microsoft_visual_studio_2026_version_18.10:*:*:*:*:*:*:*:*", "versionStartIncluding": "18.10.0", "versionEndExcluding": "18.10.4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*", "versionStartIncluding": "17.14.0", "versionEndExcluding": "17.14.42"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.0", "versionEndExcluding": "11.0.0-rc.2"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.0", "versionEndExcluding": "9.0.21"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.0", "versionEndExcluding": "10.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.0", "versionEndExcluding": "8.0.32"}]}]}], "affected": [{"vendor": "Microsoft", "product": "ASP.NET Core 10.0", "versions": [{"version": "10.0", "lessThan": "10.0.13", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "ASP.NET Core 11.0", "versions": [{"version": "11.0", "lessThan": "11.0.0-rc.2", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "ASP.NET Core 8.0", "versions": [{"version": "8.0", "lessThan": "8.0.32", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "ASP.NET Core 9.0", "versions": [{"version": "9.0", "lessThan": "9.0.21", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft Visual Studio 2022 version 17.14", "versions": [{"version": "17.14.0", "lessThan": "17.14.42", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft Visual Studio 2026 version 18.10", "versions": [{"version": "18.10.0", "lessThan": "18.10.4", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"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.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')", "lang": "en-US", "type": "CWE", "cweId": "CWE-444"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-10-13T19:16:50.310Z"}, "references": [{"name": "ASP.NET Core Security Feature Bypass Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70188"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "CRITICAL", "baseScore": 9.1, "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"}}]}}}

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{"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 ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network."}], "id": "CVE-2026-70188", "lastModified": "2026-10-13T19:29:52.750", "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": "Primary"}]}, "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": "Primary"}]}

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