GHSA-qvw7-jm5c-6hqw BIT-dotnet-2026-50528 BIT-dotnet-sdk-2026-50528 CVE-2026-50528
Microsoft Security Advisory CVE-2026-50528 – .NET Security Feature Bypass Vulnerability
- Severity
- 8.2 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- 0.61%
- Chance of exploitation in the next 30 days. Higher than 49.19% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- 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 security feature bypass vulnerability exists in .NET 8, .NET 9, and .NET 10 when processing TLS/SSL connections. An attacker can exploit the SslStream implementation to bypass authorization checks during secure communication.
Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD
CVSS Details
- Version: 3.1
- Severity: High
- Score: 8.2
- Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N - Weakness: CWE-863 (Incorrect Authorization)
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
Henrique Pereira with Microsoft, Ky0toFu
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 8.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- High
- Availability
- None
Weakness
CWE-302: Authentication Bypass by Assumed-Immutable Data
The authentication scheme or implementation uses key data elements that are assumed to be immutable, but can be controlled or modified by the attacker.
How to prevent it
- Architecture and Design, Operation, Implementation: Implement proper protection for immutable data (e.g. environment variable, hidden form fields, etc.)
CWE-863: Incorrect Authorization
The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
How to prevent it
- Architecture and Design: Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) [REF-229] to enforce the roles at the appropriate boundaries. Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
- Architecture and Design: Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records. For example, a database may restrict access for medical records to a specific database user, but each record might only be intended to be accessible to the patient and the patient's doctor [REF-7].
- Architecture and Design: Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using authorization frameworks such as the JAAS Authorization Framework [REF-233] and the OWASP ESAPI Access Control feature [REF-45].
- Architecture and Design: For web applications, make sure that the access control mechanism is enforced correctly at the server side on every page. Users should not be able to access any unauthorized functionality or information by simply requesting direct access to that page. One way to do this is to ensure that all pages containing sensitive information are not cached, and that all such pages restrict access to requests that are accompanied by an active and authenticated session token associated with a user who has the required permissions to access that page.
- System Configuration, Installation: Use the access control capabilities of your operating system and server environment and define your access control lists accordingly. Use a "default deny" policy when defining these ACLs.
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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