.NET Framework Remote Code Execution Vulnerability

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Summary

CVECVE-2026-50646
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-14 20:17:37 UTC
Updated2026-07-15 12:17:55 UTC
DescriptionProtection mechanism failure in .NET Framework allows an unauthorized attacker to execute code locally.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem Types: CWE-502 | CWE-693 | CWE-693 CWE-693: Protection Mechanism Failure | CWE-502 CWE-502: Deserialization of Untrusted Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNACVSS7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft .NET 8.0 affected 8.0.0 8.0.29 custom Not specified
CNA Microsoft .NET 9.0 affected 9.0.0 9.0.18 custom Not specified
CNA Microsoft Microsoft .NET Framework 3.5 affected 3.5.0 2.0.50727.8983 & 3.0.30729.8978 custom Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)
CNA Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 affected 4.7.0 2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0 custom Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for ARM64-based Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation)
CNA Microsoft Microsoft .NET Framework 3.5 AND 4.8 affected 4.8.0 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 custom Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for ARM64-based Systems, Windows 10 Version 1809 for x64-based Systems, Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022 (Server Core installation)
CNA Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 affected 4.8.1 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 custom Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows Server 2022, Windows Server 2022 (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)
CNA Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 affected 4.7.0 4.7.4143.0 custom Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)
CNA Microsoft Microsoft .NET Framework 4.8 affected 4.8.0 4.8.4803.0 custom Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation)
CNA Microsoft Microsoft Visual Studio 2022 Version 17.12 affected 17.12.0 17.12.22 custom Not specified
CNA Microsoft Microsoft Visual Studio 2022 Version 17.14 affected 17.14.0 17.14.36 custom Not specified
CNA Microsoft Microsoft Visual Studio 2026 Version 18.7 affected 18.0 18.7.4 custom Not specified

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50646 [email protected] msrc.microsoft.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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