GHSA-w7cw-xp7h-6j5j BIT-dotnet-2026-50524 BIT-dotnet-sdk-2026-50524 CVE-2026-50524
Microsoft Security Advisory CVE-2026-50524 – .NET Denial of Service Vulnerability
- Severity
- 7.5 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- 1.23%
- Chance of exploitation in the next 30 days. Higher than 68.99% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-1287 Improper Validation of Specified Type of Input
- Fix
- Available
- 12 packages have a fixed version
Description
Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET TLS/SSL (System.Net.Security). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
A denial of service vulnerability exists in .NET 8, .NET 9, and .NET 10 when processing TLS handshakes. An attacker can send a malformed request and cause application to crash or become unresponsive.
Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD
CVSS Details
- Version: 3.1
- Severity: High
- Score: 7.5
- Vector:
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 - Weakness: CWE-1287 (Improper Validation of Specified Type of Input)
Affected Platforms
- Platforms: All
- Architectures: All
<a name="affected-packages"></a>Affected Packages
The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below
<a name=".NET 10.0"></a>.NET 10.0
| Package name | Affected version | Patched version |
|---|---|---|
| Microsoft.NetCore.App.Runtime.linux-arm | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| Microsoft.NetCore.App.Runtime.linux-arm64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| Microsoft.NetCore.App.Runtime.linux-musl-arm | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| Microsoft.NetCore.App.Runtime.linux-musl-arm64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| Microsoft.NetCore.App.Runtime.linux-musl-x64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| Microsoft.NetCore.App.Runtime.linux-x64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| Microsoft.NetCore.App.Runtime.osx-arm64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| Microsoft.NetCore.App.Runtime.osx-x64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| Microsoft.NetCore.App.Runtime.win-arm | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| Microsoft.NetCore.App.Runtime.win-arm64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| Microsoft.NetCore.App.Runtime.win-x64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| Microsoft.NetCore.App.Runtime.win-x86 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
<a name=".NET 9.0"></a>.NET 9.0
| Package name | Affected version | Patched version |
|---|---|---|
| Microsoft.NetCore.App.Runtime.linux-arm | >= 9.0.0, <= 9.0.17 | 9.0.18 |
| Microsoft.NetCore.App.Runtime.linux-arm64 | >= 9.0.0, <= 9.0.17 | 9.0.18 |
| Microsoft.NetCore.App.Runtime.linux-musl-arm | >= 9.0.0, <= 9.0.17 | 9.0.18 |
| Microsoft.NetCore.App.Runtime.linux-musl-arm64 | >= 9.0.0, <= 9.0.17 | 9.0.18 |
| Microsoft.NetCore.App.Runtime.linux-musl-x64 | >= 9.0.0, <= 9.0.17 | 9.0.18 |
| Microsoft.NetCore.App.Runtime.linux-x64 | >= 9.0.0, <= 9.0.17 | 9.0.18 |
| Microsoft.NetCore.App.Runtime.osx-arm64 | >= 9.0.0, <= 9.0.17 | 9.0.18 |
| Microsoft.NetCore.App.Runtime.osx-x64 | >= 9.0.0, <= 9.0.17 | 9.0.18 |
| Microsoft.NetCore.App.Runtime.win-arm | >= 9.0.0, <= 9.0.17 | 9.0.18 |
| Microsoft.NetCore.App.Runtime.win-arm64 | >= 9.0.0, <= 9.0.17 | 9.0.18 |
| Microsoft.NetCore.App.Runtime.win-x64 | >= 9.0.0, <= 9.0.17 | 9.0.18 |
| Microsoft.NetCore.App.Runtime.win-x86 | >= 9.0.0, <= 9.0.17 | 9.0.18 |
<a name=".NET 8.0"></a>.NET 8.0
| Package name | Affected version | Patched version |
|---|---|---|
| Microsoft.NetCore.App.Runtime.linux-arm | >= 8.0.0, <= 8.0.28 | 8.0.29 |
| Microsoft.NetCore.App.Runtime.linux-arm64 | >= 8.0.0, <= 8.0.28 | 8.0.29 |
| Microsoft.NetCore.App.Runtime.linux-musl-arm | >= 8.0.0, <= 8.0.28 | 8.0.29 |
| Microsoft.NetCore.App.Runtime.linux-musl-arm64 | >= 8.0.0, <= 8.0.28 | 8.0.29 |
| Microsoft.NetCore.App.Runtime.linux-musl-x64 | >= 8.0.0, <= 8.0.28 | 8.0.29 |
| Microsoft.NetCore.App.Runtime.linux-x64 | >= 8.0.0, <= 8.0.28 | 8.0.29 |
| Microsoft.NetCore.App.Runtime.osx-arm64 | >= 8.0.0, <= 8.0.28 | 8.0.29 |
| Microsoft.NetCore.App.Runtime.osx-x64 | >= 8.0.0, <= 8.0.28 | 8.0.29 |
| Microsoft.NetCore.App.Runtime.win-arm | >= 8.0.0, <= 8.0.28 | 8.0.29 |
| Microsoft.NetCore.App.Runtime.win-arm64 | >= 8.0.0, <= 8.0.28 | 8.0.29 |
| Microsoft.NetCore.App.Runtime.win-x64 | >= 8.0.0, <= 8.0.28 | 8.0.29 |
| Microsoft.NetCore.App.Runtime.win-x86 | >= 8.0.0, <= 8.0.28 | 8.0.29 |
Advisory FAQ
<a name="how-affected"></a>How do I know if I am affected?
If using a package listed in affected packages, you're exposed to the vulnerability.
<a name="how-fix"></a>How do I fix the issue?
- To fix the issue please install the latest version of .NET. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs.
- If your application references the vulnerable nuget package, update the package reference to the patched version. You can list the versions you have installed by running the
dotnet --infocommand.
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect.
Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.
Other Information
Reporting Security Issues
If you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ.
Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.
Support
You can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.
Disclaimer
The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
External Links
Acknowledgements
41ae55e9310ff27fa6f26af4727e5590
Revisions
V1.0 (July 14, 2026): Advisory published.
Affected versions
NuGet
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
Microsoft.NetCore.App.Runtime.linux-arm NuGet → 10.0.10
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.linux-arm --version 10.0.10
Microsoft.NetCore.App.Runtime.linux-arm64 NuGet → 10.0.10
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.linux-arm64 --version 10.0.10
Microsoft.NetCore.App.Runtime.linux-musl-arm NuGet → 10.0.10
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm --version 10.0.10
Microsoft.NetCore.App.Runtime.linux-musl-arm64 NuGet → 10.0.10
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm64 --version 10.0.10
Microsoft.NetCore.App.Runtime.linux-musl-x64 NuGet → 10.0.10
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-x64 --version 10.0.10
Microsoft.NetCore.App.Runtime.linux-x64 NuGet → 10.0.10
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.linux-x64 --version 10.0.10
Microsoft.NetCore.App.Runtime.osx-arm64 NuGet → 10.0.10
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.osx-arm64 --version 10.0.10
Microsoft.NetCore.App.Runtime.osx-x64 NuGet → 10.0.10
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.osx-x64 --version 10.0.10
Microsoft.NetCore.App.Runtime.win-arm NuGet → 10.0.10
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.win-arm --version 10.0.10
Microsoft.NetCore.App.Runtime.win-arm64 NuGet → 10.0.10
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.win-arm64 --version 10.0.10
Microsoft.NetCore.App.Runtime.win-x64 NuGet → 10.0.10
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.win-x64 --version 10.0.10
Microsoft.NetCore.App.Runtime.win-x86 NuGet → 10.0.10
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.win-x86 --version 10.0.10
Severity breakdown
CVSS 3.1 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-1287: Improper Validation of Specified Type of Input
The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.
How to prevent it
- Implementation: Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does. When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue." Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| CVE-2020-1147 .NET Framework, SharePoint Server, and Visual Studio Remote Code Execution Vulnerability | High Known exploited | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-87vj-4hqv-22p9 Microsoft Security Advisory CVE-2026-96233 - .NET and Visual Studio Denial of Service Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-2j93-m82w-73j2 Microsoft Security Advisory CVE-2026-96231 - .NET and Visual Studio Elevation of Privilege Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-w6wh-p4g7-mpj2 Microsoft Security Advisory CVE-2026-96225 - .NET and Visual Studio Elevation of Privilege Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-4mpw-cpwj-hxxj Microsoft Security Advisory CVE-2026-70197 - .NET and Visual Studio Remote Code Execution Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.win-arm64 |
| GHSA-fqpq-cx42-9jmm Microsoft Security Advisory CVE-2026-70194 - .NET and Visual Studio Security Feature Bypass Vulnerability | Medium | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-3rxq-g8rj-r2cf Microsoft Security Advisory CVE-2026-69651 - .NET and Visual Studio Denial of Service Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-wxxw-5cvc-53j7 Microsoft Security Advisory CVE-2026-66822 - .NET and Visual Studio Information Disclosure Vulnerability | Medium | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
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