CVE-2026-84008

Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84008

Configurations

No configuration.

History

13 Oct 2026, 19:20

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-13 19:20

Updated : 2026-10-22 22:19

NVD link : CVE-2026-84008

Mitre link : CVE-2026-84008

CVE.ORG link : CVE-2026-84008

JSON object : View

Products Affected

No product.

CWE

CWE-407

Inefficient Algorithmic Complexity

{"id": "CVE-2026-84008", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-84008", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-13T22:07:10.813689Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"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": "2.0.50727.9073 AND 3.0.30729.9070 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"}]}, {"vendor": "Microsoft", "product": "System.Security.Cryptography.Pkcs", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "10.0.13", "versionType": "custom"}], "platforms": [".NET 10.0 runtime installed on Linux", ".NET 10.0 runtime installed on Mac OS", ".NET 10.0 runtime installed on Windows", ".NET 11.0 runtime installed on Linux", ".NET 11.0 runtime installed on Mac OS", ".NET 11.0 runtime installed on Windows", ".NET 8.0 runtime installed on Linux", ".NET 8.0 runtime installed on Mac OS", ".NET 8.0 runtime installed on Windows", ".NET 9.0 runtime installed on Linux", ".NET 9.0 runtime installed on Mac OS", ".NET 9.0 runtime installed on Windows"]}]}], "published": "2026-10-13T19:20:50.780", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84008", "source": "secure@microsoft.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-407"}]}], "descriptions": [{"lang": "en", "value": "Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network."}], "lastModified": "2026-10-22T22:19:18.997", "sourceIdentifier": "secure@microsoft.com"}