{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-83520", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-08-31T15:57:21.155Z", "datePublished": "2026-10-13T19:01:15.820Z", "dateUpdated": "2026-10-16T23:24:47.164Z"}, "containers": {"cna": {"title": ".NET Remote Code Execution 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:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8.1", "versionEndExcluding": "2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8.0.0", "versionEndExcluding": "4.8.9363.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.0.0", "versionEndExcluding": "11.0.0-rc.2"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.0.0", "versionEndExcluding": "10.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.0.0", "versionEndExcluding": "8.0.32"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.0.0", "versionEndExcluding": "9.0.21"}, {"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:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5.0", "versionEndExcluding": "2.0.50727.9188 AND 3.0.30729.9171"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.0.0.0", "versionEndExcluding": "2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7.0", "versionEndExcluding": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8.0", "versionEndExcluding": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7.0", "versionEndExcluding": "4.7.4150.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8.0", "versionEndExcluding": "4.8.4811.0"}]}]}], "affected": [{"vendor": "Microsoft", "product": ".NET 10.0", "versions": [{"version": "10.0.0", "lessThan": "10.0.13", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": ".NET 11.0", "versions": [{"version": "11.0.0", "lessThan": "11.0.0-rc.2", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": ".NET 8.0", "versions": [{"version": "8.0.0", "lessThan": "8.0.32", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": ".NET 9.0", "versions": [{"version": "9.0.0", "lessThan": "9.0.21", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5", "platforms": ["Windows 11 version 26H1", "Windows Server 2012", "Windows Server 2012 R2"], "versions": [{"version": "3.5.0", "lessThan": "2.0.50727.9188 AND 3.0.30729.9171", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2", "platforms": ["Windows 10 version 1607", "Windows Server 2016", "Windows Server 2019"], "versions": [{"version": "3.0.0.0", "lessThan": "2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5 AND 4.7.2", "platforms": ["Windows 10 version 1809"], "versions": [{"version": "4.7.0", "lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5 AND 4.8", "platforms": ["Windows 10 version 1809", "Windows 10 version 21H2", "Windows 10 version 22H2", "Windows Server 2019", "Windows Server 2022"], "versions": [{"version": "4.8.0", "lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5 AND 4.8.1", "platforms": ["Windows 10 version 21H2", "Windows 10 version 22H2", "Windows 11 version 23H2", "Windows 11 version 24H2", "Windows 11 version 25H2", "Windows 11 version 26H2", "Windows Server 2022", "Windows Server 2025"], "versions": [{"version": "4.8.1", "lessThan": "2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2", "platforms": ["Windows Server 2012", "Windows Server 2012 R2"], "versions": [{"version": "4.7.0", "lessThan": "4.7.4150.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 4.8", "platforms": ["Windows 10 version 1607", "Windows Server 2012", "Windows Server 2012 R2", "Windows Server 2016"], "versions": [{"version": "4.8.0", "lessThan": "4.8.4811.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 4.8.1", "platforms": ["Windows 11 version 26H1"], "versions": [{"version": "4.8.0.0", "lessThan": "4.8.9363.0", "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": "Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-502: Deserialization of Untrusted Data", "lang": "en-US", "type": "CWE", "cweId": "CWE-502"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-10-16T23:24:47.164Z"}, "references": [{"name": ".NET Remote Code Execution Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83520"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "HIGH", "baseScore": 8.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-08T00:00:00+00:00", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-83520"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-14T03:56:52.829Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-83520", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-13T20:40:49.597763Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-13T20:40:50.313Z"}}], "cna": {"title": ".NET Remote Code Execution Vulnerability", "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "baseScore": 8.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C"}, "scenarios": [{"lang": "en-US", "value": "GENERAL"}]}], "affected": [{"vendor": "Microsoft", "product": ".NET 10.0", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "10.0.13", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": ".NET 11.0", "versions": [{"status": "affected", "version": "11.0.0", "lessThan": "11.0.0-rc.2", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": ".NET 8.0", "versions": [{"status": "affected", "version": "8.0.0", "lessThan": "8.0.32", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": ".NET 9.0", "versions": [{"status": "affected", "version": "9.0.0", "lessThan": "9.0.21", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5", "versions": [{"status": "affected", "version": "3.5.0", "lessThan": "2.0.50727.9188 AND 3.0.30729.9171", "versionType": "custom"}], "platforms": ["Windows 11 version 26H1", "Windows Server 2012", "Windows Server 2012 R2"]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2", "versions": [{"status": "affected", "version": "3.0.0.0", "lessThan": "2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0", "versionType": "custom"}], "platforms": ["Windows 10 version 1607", "Windows Server 2016", "Windows Server 2019"]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5 AND 4.7.2", "versions": [{"status": "affected", "version": "4.7.0", "lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0", "versionType": "custom"}], "platforms": ["Windows 10 version 1809"]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5 AND 4.8", "versions": [{"status": "affected", "version": "4.8.0", "lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0", "versionType": "custom"}], "platforms": ["Windows 10 version 1809", "Windows 10 version 21H2", "Windows 10 version 22H2", "Windows Server 2019", "Windows Server 2022"]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5 AND 4.8.1", "versions": [{"status": "affected", "version": "4.8.1", "lessThan": "2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0", "versionType": "custom"}], "platforms": ["Windows 10 version 21H2", "Windows 10 version 22H2", "Windows 11 version 23H2", "Windows 11 version 24H2", "Windows 11 version 25H2", "Windows 11 version 26H2", "Windows Server 2022", "Windows Server 2025"]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2", "versions": [{"status": "affected", "version": "4.7.0", "lessThan": "4.7.4150.0", "versionType": "custom"}], "platforms": ["Windows Server 2012", "Windows Server 2012 R2"]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 4.8", "versions": [{"status": "affected", "version": "4.8.0", "lessThan": "4.8.4811.0", "versionType": "custom"}], "platforms": ["Windows 10 version 1607", "Windows Server 2012", "Windows Server 2012 R2", "Windows Server 2016"]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 4.8.1", "versions": [{"status": "affected", "version": "4.8.0.0", "lessThan": "4.8.9363.0", "versionType": "custom"}], "platforms": ["Windows 11 version 26H1"]}, {"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"}]}], "datePublic": "2026-10-13T14:00:00.000Z", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83520", "name": ".NET Remote Code Execution Vulnerability", "tags": ["vendor-advisory", "patch"]}], "descriptions": [{"lang": "en-US", "value": "Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network."}], "problemTypes": [{"descriptions": [{"lang": "en-US", "type": "CWE", "cweId": "CWE-502", "description": "CWE-502: Deserialization of Untrusted Data"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:microsoft_visual_studio_2026_version_18.10:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "18.10.4", "versionStartIncluding": "18.10.0"}, {"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0", "versionStartIncluding": "4.8.1"}, {"criteria": "cpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.8.9363.0", "versionStartIncluding": "4.8.0.0"}, {"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "11.0.0-rc.2", "versionStartIncluding": "11.0.0"}, {"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "10.0.13", "versionStartIncluding": "10.0.0"}, {"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "8.0.32", "versionStartIncluding": "8.0.0"}, {"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "9.0.21", "versionStartIncluding": "9.0.0"}, {"criteria": "cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "17.14.42", "versionStartIncluding": "17.14.0"}, {"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "2.0.50727.9188 AND 3.0.30729.9171", "versionStartIncluding": "3.5.0"}, {"criteria": "cpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0", "versionStartIncluding": "3.0.0.0"}, {"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0", "versionStartIncluding": "4.7.0"}, {"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0", "versionStartIncluding": "4.8.0"}, {"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.7.4150.0", "versionStartIncluding": "4.7.0"}, {"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.8.4811.0", "versionStartIncluding": "4.8.0"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-10-15T22:30:07.745Z"}}}, "cveMetadata": {"cveId": "CVE-2026-83520", "state": "PUBLISHED", "dateUpdated": "2026-10-15T22:30:07.745Z", "dateReserved": "2026-08-31T15:57:21.155Z", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "datePublished": "2026-10-13T19:01:15.820Z", "assignerShortName": "microsoft"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": ".NET 10.0", "vendor": "Microsoft", "versions": [{"lessThan": "10.0.13", "status": "affected", "version": "10.0.0", "versionType": "custom"}]}, {"product": ".NET 11.0", "vendor": "Microsoft", "versions": [{"lessThan": "11.0.0-rc.2", "status": "affected", "version": "11.0.0", "versionType": "custom"}]}, {"product": ".NET 8.0", "vendor": "Microsoft", "versions": [{"lessThan": "8.0.32", "status": "affected", "version": "8.0.0", "versionType": "custom"}]}, {"product": ".NET 9.0", "vendor": "Microsoft", "versions": [{"lessThan": "9.0.21", "status": "affected", "version": "9.0.0", "versionType": "custom"}]}, {"platforms": ["Windows 11 version 26H1", "Windows Server 2012", "Windows Server 2012 R2"], "product": "Microsoft .NET Framework 3.5", "vendor": "Microsoft", "versions": [{"lessThan": "2.0.50727.9188 AND 3.0.30729.9171", "status": "affected", "version": "3.5.0", "versionType": "custom"}]}, {"platforms": ["Windows 10 version 1607", "Windows Server 2016", "Windows Server 2019"], "product": "Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2", "vendor": "Microsoft", "versions": [{"lessThan": "2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0", "status": "affected", "version": "3.0.0.0", "versionType": "custom"}]}, {"platforms": ["Windows 10 version 1809"], "product": "Microsoft .NET Framework 3.5 AND 4.7.2", "vendor": "Microsoft", "versions": [{"lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0", "status": "affected", "version": "4.7.0", "versionType": "custom"}]}, {"platforms": ["Windows 10 version 1809", "Windows 10 version 21H2", "Windows 10 version 22H2", "Windows Server 2019", "Windows Server 2022"], "product": "Microsoft .NET Framework 3.5 AND 4.8", "vendor": "Microsoft", "versions": [{"lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0", "status": "affected", "version": "4.8.0", "versionType": "custom"}]}, {"platforms": ["Windows 10 version 21H2", "Windows 10 version 22H2", "Windows 11 version 23H2", "Windows 11 version 24H2", "Windows 11 version 25H2", "Windows 11 version 26H2", "Windows Server 2022", "Windows Server 2025"], "product": "Microsoft .NET Framework 3.5 AND 4.8.1", "vendor": "Microsoft", "versions": [{"lessThan": "2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0", "status": "affected", "version": "4.8.1", "versionType": "custom"}]}, {"platforms": ["Windows Server 2012", "Windows Server 2012 R2"], "product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2", "vendor": "Microsoft", "versions": [{"lessThan": "4.7.4150.0", "status": "affected", "version": "4.7.0", "versionType": "custom"}]}, {"platforms": ["Windows 10 version 1607", "Windows Server 2012", "Windows Server 2012 R2", "Windows Server 2016"], "product": "Microsoft .NET Framework 4.8", "vendor": "Microsoft", "versions": [{"lessThan": "4.8.4811.0", "status": "affected", "version": "4.8.0", "versionType": "custom"}]}, {"platforms": ["Windows 11 version 26H1"], "product": "Microsoft .NET Framework 4.8.1", "vendor": "Microsoft", "versions": [{"lessThan": "4.8.9363.0", "status": "affected", "version": "4.8.0.0", "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": "Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network."}], "id": "CVE-2026-83520", "lastModified": "2026-10-14T04:18:38.083", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "secure@microsoft.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-83520", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-08T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-10-13T19:19:57.933", "references": [{"source": "secure@microsoft.com", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83520"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-502"}], "source": "secure@microsoft.com", "type": "Secondary"}]}

{"bugzilla": {"description": "dotnet: dotnet: Arbitrary code execution via untrusted data deserialization", "id": "2550820", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2550820"}, "csaw": false, "cwe": "CWE-502", "details": ["A flaw was found in .NET. An insecure deserialization vulnerability allows an unauthenticated remote attacker to achieve arbitrary code execution over a network. By convincing an application or user to process specially crafted serialized data, an attacker can execute malicious commands with the privileges of the affected application."], "name": "CVE-2026-83520", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "dotnet8.0", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-10-13T19:01:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-83520\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-83520\nhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83520"], "threat_severity": "Important"}

{"created": "2026-10-14T03:30:17.806737+00:00", "updated": "2026-10-16T23:15:14.273850+00:00", "vendors": []}