CVE-2026-32203 .NET and Visual Studio Denial of Service Vulnerability
An unauthorized attacker can cause a denial of service via a stack-based buffer overflow in .NET and Visual Studio.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-32203?
CVE-2026-32203 is a high-severity memory corruption vulnerability in Microsoft .Net, published on 14 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Stack-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to deny service over a network.
Which versions are affected by CVE-2026-32203?
8 open source packages ship an affected version, including System.Security.Cryptography.Xml, dotnet and dotnet-sdk. It affects 3 products.
| Package | Affected | Fixed in |
|---|---|---|
System.Security.Cryptography.Xml NuGet | From 10.0.0 | 10.0.6 |
System.Security.Cryptography.Xml NuGet | From 10.0.0 | 10.0.6 |
System.Security.Cryptography.Xml NuGet | From 8.0.0 | 8.0.3 |
System.Security.Cryptography.Xml NuGet | From 8.0.0 | 8.0.3 |
System.Security.Cryptography.Xml NuGet | From 9.0.0 | 9.0.15 |
System.Security.Cryptography.Xml NuGet | From 9.0.0 | 9.0.15 |
2 more packages
dotnet Bitnami | From 8.0.0 | 8.0.26, 9.0.15, 10.0.6 |
dotnet-sdk Bitnami | From 8.0.0 | 8.0.26, 9.0.15, 10.0.6 |
Products include Microsoft .Net, Microsoft Visual Studio 2022, Microsoft Visual Studio 2026.
How do I fix CVE-2026-32203?
Upgrade System.Security.Cryptography.Xml to a fixed version for your release line: 10.0.6, 8.0.3 or 9.0.15.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-32203 being exploited?
There is no known exploitation of CVE-2026-32203 in the wild and no public exploit code.
Other vulnerabilities in Microsoft .Net
- CVE-2024-43498 .NET and Visual Studio Remote Code Execution Vulnerability
- CVE-2024-0057 NET, .NET Framework, and Visual Studio Security Feature Bypass Vulnerability
- CVE-2026-96957 .NET Security Feature Bypass Vulnerability
- CVE-2026-69439 .NET and Visual Studio Elevation of Privilege Vulnerability
- CVE-2026-71328 .NET and Visual Studio Remote Code Execution Vulnerability
Sources
Also known as BIT-dotnet-2026-32203, BIT-dotnet-sdk-2026-32203, ECHO-0bb4-e61f-82a1, GHSA-6588-8gv4-xfgh, MINI-2m8v-pvcm-c529, MINI-5cmw-vm73-6cw5 and 9 more.