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Privacy Statement Third-Party Cookies AcceptRejectManage cookies MSRC  Customer Guidance  Security Update Guide  Vulnerabilities  CVE-2026-50527 .NET Framework Denial of Service Vulnerability New On this page  CVE-2026-50527  Subscribe RSS PowerShell  API  CSAF Security Vulnerability Released: Jul 14, 2026 Assigning CNA Microsoft CVE.org link CVE-2026-50527  Impact Denial of Service Max Severity Important Weakness CWE-121: Stack-based Buffer Overflow CVSS Source Microsoft Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C Metrics CVSS:3.1 7.5 / 6.5  Base score metrics: 7.5 / Temporal score metrics: 6.5  Expand all  Collapse all Metric Value   Base score metrics(8) Attack Vector Network Attack Complexity Low Privileges Required None User Interaction None Scope Unchanged Confidentiality None Integrity None Availability High   Temporal score metrics(3) Exploit Code Maturity Unproven Remediation Level Official Fix Report Confidence Confirmed Please see Common Vulnerability Scoring System for more information on the definition of these metrics. Executive Summary Stack-based buffer overflow in .NET Framework allows an unauthorized attacker to deny service over a network. Exploitability The following table provides an exploitability assessment for this vulnerability at the time of original publication. Publicly disclosed No Exploited No Exploitability assessment Exploitation Less Likely Acknowledgements Levi Broderick Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information. Security Updates To determine the support lifecycle for your software, see the Microsoft Support Lifecycle. Release date Descending  Edit columns  Download  Filters  Product Family  Max Severity  Impact  Platform   Clear Release date  Product Platform Impact Max Severity Article Download Build Number Assigning CNA Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 Windows Server 2012 Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5, Content:, 1 link 5087048  Title: Download Security Update for Microsoft .NET Framework 3.5, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.8983 & 3.0.30729.8978 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 Windows Server 2012 R2 (Server Core installation) Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5, Content:, 1 link 5087049  Title: Download Security Update for Microsoft .NET Framework 3.5, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.8983 & 3.0.30729.8978 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 Windows Server 2012 (Server Core installation) Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5, Content:, 1 link 5087048  Title: Download Security Update for Microsoft .NET Framework 3.5, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.8983 & 3.0.30729.8978 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows 11 version 26H1 for x64-based Systems Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 2 links 5087077  5092431  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 2 links Security Update  Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 4.8.9340.0 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows 11 Version 23H2 for ARM64-based Systems Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link 5087058  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows 11 Version 24H2 for x64-based Systems Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link 5092430  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows 11 Version 26H1 for ARM64-based Systems Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 2 links 5087077  5092431  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 2 links Security Update  Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 4.8.9340.0 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows Server 2025 Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link 5087057  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows 11 Version 25H2 for x64-based Systems Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link 5092427  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows 10 Version 22H2 for 32-bit Systems Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link 5087053  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows 10 Version 22H2 for ARM64-based Systems Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link 5087053  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows 10 Version 22H2 for x64-based Systems Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link 5087053  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows Server 2022 (Server Core installation) Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link 5087059  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows Server 2022 Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link 5087059  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows 10 Version 21H2 for ARM64-based Systems Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link 5087053  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft .NET Framework 3.5 AND 4.8.1 Windows 10 Version 21H2 for 32-bit Systems Denial of Service Important Title: Knowledge Base Articles for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link 5087053  Title: Download Security Update for Microsoft .NET Framework 3.5 AND 4.8.1, Content:, 1 link Security Update  Title: Build numbers, Content: 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 Title: Assigning CNA, Content: Microsoft Title: Release da