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| purl | pkg:nuget/System.Security.Cryptography.Cose@8.0.1 |
| Vulnerability | Summary | Fixed by |
|---|---|---|
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VCID-3w4x-63m1-bfcs
Aliases: CVE-2026-21218 GHSA-qvhc-9v3j-5rfw |
# Microsoft Security Advisory CVE-2026-21218 | .NET Security Feature Bypass Vulnerability ## <a name="executive-summary"></a>Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0, .NET 9.0, and .NET 10.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An attacker could exploit this vulnerability by crafting a malicious payload that bypasses the security checks in the affected System.Security.Cryptography.Cose versions, potentially leading to unauthorized access or data manipulation. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/380 ## <a name="mitigation-factors"></a>Mitigation factors If your application does not use System.Security.Cryptography.Cose it is not affected. By default, no .NET applications reference this component. ## <a name="affected-packages"></a>Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected packages versions listed below ### <a name=".NET 10"></a>.NET 10 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [System.Security.Cryptography.Cose](https://www.nuget.org/packages/System.Security.Cryptography.Cose) | >= 10.0.0, <= 10.0.2 | 10.0.3 ### <a name=".NET 9"></a>.NET 9 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [System.Security.Cryptography.Cose](https://www.nuget.org/packages/System.Security.Cryptography.Cose) | >= 9.0.0, <= 9.0.12 | 9.0.13 ### <a name=".NET 8"></a>.NET 8 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [System.Security.Cryptography.Cose](https://www.nuget.org/packages/System.Security.Cryptography.Cose) | >= 8.0.0, <= 8.0.1 | 8.0.2 ## Advisory FAQ ### <a name="how-affected"></a>How do I know if I am affected? If an affected package listed in [affected software](#affected-software) or [affected packages](#affected-packages), you're exposed to the vulnerability. ### <a name="how-fix"></a>How do I fix the issue? To update the Using the System.Security.Cryptography.Cose NuGet package, use one of the following methods: NuGet Package Manager UI in Visual Studio: - Open your project in Visual Studio. - Right-click on your project in Solution Explorer and select "Manage NuGet Packages..." or navigate to "Project > Manage NuGet Packages". - In the NuGet Package Manager window, select the "Updates" tab. This tab lists packages with available updates from your configured package sources. - Select the package(s) you wish to update. You can choose a specific version from the dropdown or update to the latest available version. - Click the "Update" button. Using the NuGet Package Manager Console in Visual Studio: - Open your project in Visual Studio. - Navigate to "Tools > NuGet Package Manager > Package Manager Console". - To update a specific package to its latest version, use the following Update-Package command: ``` Update-Package -Id System.Security.Cryptography.Cose ``` Using the .NET CLI (Command Line Interface): - Open a terminal or command prompt in your project's directory. - To update a specific package to its latest version, use the following add package command: ``` dotnet add package System.Security.Cryptography.Cose ``` Once you have updated the nuget package reference you must recompile and deploy your application. Additionally we recommend you update your runtime and/or SDKs, but it is not necessary to patch the vulnerability. ## 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](https://msrc.microsoft.com/report/vulnerability/new). Further information can be found in the MSRC [Report an Issue FAQ](https://www.microsoft.com/msrc/faqs-report-an-issue). 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 [CVE-2026-21218](https://www.cve.org/CVERecord?id=CVE-2026-21218) ### Acknowledgements vcsjones with GitHub ### Revisions V1.0 (February 10, 2026): Advisory published. |
Affected by 0 other vulnerabilities. Affected by 0 other vulnerabilities. Affected by 0 other vulnerabilities. |
| Vulnerability | Summary | Aliases |
|---|---|---|
| VCID-fmn9-f48h-q7b9 | # Microsoft Security Advisory CVE-2024-43483 | .NET Denial of Service Vulnerability ## <a name="executive-summary"></a>Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in System.Security.Cryptography.Cose, System.IO.Packaging, Microsoft.Extensions.Caching.Memory. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. System.Security.Cryptography.Cose, System.IO.Packaging, Microsoft.Extensions.Caching.Memory may be exposed to a hostile input which may lead them to be susceptible to hash flooding attacks resulting in denial of service. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/327 ## <a name="mitigation-factors"></a>Mitigation factors Microsoft has not identified any mitigating factors for this vulnerability. ## <a name="affected-software"></a>Affected software * Any .NET 8.0 application running on .NET 8.0.8 or earlier. * Any .NET 6.0 aplication running on .NET 6.0.33 or earlier. * Any application consuming one of the [vulnerable packages](affected-packages). ## <a name="affected-packages"></a>Affected Packages * Any .NET 6.0, 8.0, or 9.0 application. * Any application consuming one of the vulnerable packages. ### <a name=".NET 9 "></a>.NET 9 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [System.Security.Cryptography.Cose](https://www.nuget.org/packages/System.Security.Cryptography.Cose) | >= 9.0.0-preview.1.24080.9, <= 9.0.0-rc.1.24431.7 | 9.0.0-rc.2.24473.5 [System.IO.Packaging](https://www.nuget.org/packages/System.IO.Packaging) | >= 9.0.0-preview.1.24080.9, <= 9.0.0-rc.1.24431.7 | 9.0.0-rc.2.24473.5 [Microsoft.Extensions.Caching.Memory](https://www.nuget.org/packages/Microsoft.Extensions.Caching.Memory) | >= 9.0.0-preview.1.24080.9, <= 9.0.0-rc.1.24431.7 | 9.0.0-rc.2.24473.5 ### <a name=".NET 8"></a>.NET 8 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [System.Security.Cryptography.Cose](https://www.nuget.org/packages/System.Security.Cryptography.Cose) | >= 8.0.0-preview.1.23110.8, <= 8.0.0 | 8.0.1 [System.IO.Packaging](https://www.nuget.org/packages/System.IO.Packaging) | >= 8.0.0-preview.1.23110.8, <= 8.0.0 | 8.0.1 [Microsoft.Extensions.Caching.Memory](https://www.nuget.org/packages/Microsoft.Extensions.Caching.Memory) | >= 8.0.0-preview.1.23110.8, <= 8.0.0 | 8.0.1 ### <a name=".NET 6"></a>.NET 6 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [System.IO.Packaging](https://www.nuget.org/packages/System.IO.Packaging) | >= 6.0.0-preview.1.21102.12, <= 6.0.0 | 6.0.1 [Microsoft.Extensions.Caching.Memory](https://www.nuget.org/packages/Microsoft.Extensions.Caching.Memory) | >=6.0.0-preview.1.21102.12 <= 6.0.1 | 6.0.2 ## Advisory FAQ ### <a name="how-affected"></a>How do I know if I am affected? If you have a runtime or SDK with a version listed, or an affected package listed in [affected software](#affected-packages) or [affected packages](#affected-software), 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 8.0 or .NET 6.0. 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. * .NET Framework-based applications and other application types need to perform a package update. * If you have .NET 6.0 or greater installed, you can list the versions you have installed by running the `dotnet --info` command. You will see output like the following; ``` .NET Core SDK (reflecting any global.json): Version: 8.0.200 Commit: 8473146e7d Runtime Environment: OS Name: Windows OS Version: 10.0.18363 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\6.0.300\ Host (useful for support): Version: 8.0.3 Commit: 8473146e7d .NET Core SDKs installed: 8.0.200 [C:\Program Files\dotnet\sdk] .NET Core runtimes installed: Microsoft.AspAspNetCore.App 8.0.3 [C:\Program Files\dotnet\shared\Microsoft.AspAspNetCore.App] Microsoft.AspNetCore.App 8.0.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.WindowsDesktop.App 8.0.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] To install additional .NET Core runtimes or SDKs: https://aka.ms/dotnet-download ``` * If you're using .NET 9.0, you should download and install .NET 9.0 RC 2 Runtime or .NET 9.0.100-rc.2.24474.11 SDK (for Visual Studio 2022 v17.12 latest Preview) from https://dotnet.microsoft.com/download/dotnet-core/9.0. * If you're using .NET 8.0, you should download and install .NET 8.0.10 Runtime or .NET 8.0.110 SDK (for Visual Studio 2022 v17.8) from https://dotnet.microsoft.com/download/dotnet-core/8.0. * If you're using .NET 6.0, you should download and install .NET 6.0.35 Runtime or .NET 6.0.135 SDK (for Visual Studio 2022 v17.6) from https://dotnet.microsoft.com/download/dotnet-core/6.0. .NET 6.0 and .NET 8.0 updates are also available from Microsoft Update. To access this either type "Check for updates" in your Windows search, or open Settings, choose Update & Security and then click Check for Updates. 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](https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd) 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 .NET 8.0 or .NET 6.0, please email details to secure@microsoft.com. Reports may qualify for the Microsoft .NET Core & .NET 5 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 and https://github.com/dotnet/aspnet/. 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 [CVE-2024-43483]( https://www.cve.org/CVERecord?id=CVE-2024-43483) ### Revisions V1.0 (October 08, 2024): Advisory published. _Version 1.0_ _Last Updated 2024-10-08_ |
CVE-2024-43483
GHSA-qj66-m88j-hmgj |