CVE-2026-120796

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-120796", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-11-02T22:42:10.893Z", "datePublished": "2026-11-10T18:23:53.968Z", "dateUpdated": "2026-11-12T21:51:03.733Z"}, "containers": {"cna": {"title": ".NET Denial of Service Vulnerability", "datePublic": "2026-11-10T16:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_11.0_installed_on_windows:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.0.0-preview.1", "versionEndExcluding": "11.0.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_11.0_installed_on_linux:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.0.0-preview.1", "versionEndExcluding": "11.0.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_11.0_installed_on_mac_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.0.0-preview.1", "versionEndExcluding": "11.0.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:system.text.json:*:*:*:*:*:*:*:*", "versionStartIncluding": "NOT_YET_AVAILABLE", "versionEndExcluding": "11.0.0"}]}]}], "affected": [{"vendor": "Microsoft", "product": ".NET 11.0 installed on Linux", "versions": [{"version": "11.0.0-preview.1", "lessThan": "11.0.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": ".NET 11.0 installed on Mac OS", "versions": [{"version": "11.0.0-preview.1", "lessThan": "11.0.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": ".NET 11.0 installed on Windows", "versions": [{"version": "11.0.0-preview.1", "lessThan": "11.0.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "System.Text.Json", "versions": [{"version": "NOT_YET_AVAILABLE", "lessThan": "11.0.0", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-407: Inefficient Algorithmic Complexity", "lang": "en-US", "type": "CWE", "cweId": "CWE-407"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-11-12T21:51:03.733Z"}, "references": [{"name": ".NET Denial of Service Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-120796"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-11-11T01:34:09.164243Z", "id": "CVE-2026-120796", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-11T01:37:16.139Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-120796", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-11-02T22:42:10.893Z", "datePublished": "2026-11-10T18:23:53.968Z", "dateUpdated": "2026-11-11T17:19:29.846Z"}, "containers": {"cna": {"title": ".NET Denial of Service Vulnerability", "datePublic": "2026-11-10T16:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_11.0_installed_on_windows:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.0.0-preview.1", "versionEndExcluding": "11.0.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_11.0_installed_on_linux:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.0.0-preview.1", "versionEndExcluding": "11.0.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_11.0_installed_on_mac_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.0.0-preview.1", "versionEndExcluding": "11.0.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:system.text.json:*:*:*:*:*:*:*:*", "versionStartIncluding": "NOT_YET_AVAILABLE", "versionEndExcluding": "11.0.0"}]}]}], "affected": [{"vendor": "Microsoft", "product": ".NET 11.0 installed on Linux", "versions": [{"version": "11.0.0-preview.1", "lessThan": "11.0.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": ".NET 11.0 installed on Mac OS", "versions": [{"version": "11.0.0-preview.1", "lessThan": "11.0.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": ".NET 11.0 installed on Windows", "versions": [{"version": "11.0.0-preview.1", "lessThan": "11.0.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "System.Text.Json", "versions": [{"version": "NOT_YET_AVAILABLE", "lessThan": "11.0.0", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-407: Inefficient Algorithmic Complexity", "lang": "en-US", "type": "CWE", "cweId": "CWE-407"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-11-11T17:19:29.846Z"}, "references": [{"name": ".NET Denial of Service Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-120796"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C"}}]}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-120796", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-11T01:34:09.164243Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-11T01:37:09.534Z"}}]}}

{"affected": [{"affectedData": [{"product": ".NET 11.0 installed on Linux", "vendor": "Microsoft", "versions": [{"lessThan": "11.0.0", "status": "affected", "version": "11.0.0-preview.1", "versionType": "custom"}]}, {"product": ".NET 11.0 installed on Mac OS", "vendor": "Microsoft", "versions": [{"lessThan": "11.0.0", "status": "affected", "version": "11.0.0-preview.1", "versionType": "custom"}]}, {"product": ".NET 11.0 installed on Windows", "vendor": "Microsoft", "versions": [{"lessThan": "11.0.0", "status": "affected", "version": "11.0.0-preview.1", "versionType": "custom"}]}, {"product": "System.Text.Json", "vendor": "Microsoft", "versions": [{"lessThan": "11.0.0", "status": "affected", "version": "NOT_YET_AVAILABLE", "versionType": "custom"}]}], "source": "secure@microsoft.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network."}], "id": "CVE-2026-120796", "lastModified": "2026-11-11T02:17:10.660", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "secure@microsoft.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-120796", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-11T01:34:09.164243Z", "version": "2.0.3"}}]}, "published": "2026-11-10T19:20:28.990", "references": [{"source": "secure@microsoft.com", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-120796"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-407"}], "source": "secure@microsoft.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[11.0.0-preview.1,11.0.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": ".NET 11.0 installed on Linux", "source": "cna", "vendor": "Microsoft"}, "product": ".net_11.0_installed_on_linux", "vendor": "microsoft"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[11.0.0-preview.1,11.0.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": ".NET 11.0 installed on Mac OS", "source": "cna", "vendor": "Microsoft"}, "product": ".net_11.0_installed_on_mac_os", "vendor": "microsoft"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[11.0.0-preview.1,11.0.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": ".NET 11.0 installed on Windows", "source": "cna", "vendor": "Microsoft"}, "product": ".net_11.0_installed_on_windows", "vendor": "microsoft"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[NOT_YET_AVAILABLE,11.0.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "System.Text.Json", "source": "cna", "vendor": "Microsoft"}, "product": "system.text.json", "vendor": "microsoft"}], "created": "2026-11-11T21:45:16.586958+00:00", "updated": "2026-11-13T12:30:04.871410+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$.net_11.0_installed_on_linux", "microsoft$PRODUCT$.net_11.0_installed_on_mac_os", "microsoft$PRODUCT$.net_11.0_installed_on_windows", "microsoft$PRODUCT$system.text.json"]}