CVE-2026-32226: .NET Framework Denial of Service Vulnerability
Overview
- Severity
- Medium (CVSS 5.9)
- CVSS Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
- Category
- Denial of Service
- Exploit Status
- Not Exploited
- Exploitation Likelihood
- Less Likely
- Patch Tuesday
- 2026-Apr
- Released
- 2026-04-14
Description
Concurrent execution using shared resource with improper synchronization ('race condition') in .NET Framework allows an unauthorized attacker to deny service over a network.
FAQ
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.
Affected Products (14)
Developer Tools
- Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems
- Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)
- Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation)
- Microsoft .NET Framework 4.8 on Windows Server 2012 R2
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for ARM64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 20H2 (Server Core Installation)
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H1 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025 (Server Core installation)
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025
Security Updates (8)
Acknowledgments
Anonymous
Revision History
- 2026-04-14: Information published.