GHSA-vh55-786g-wjwj — System.Security.Cryptogra…
MEDIUMGHSA-vh55-786g-wjwj is a medium-severity (CVSS 5.9) CWE-290 vulnerability in System.Security.Cryptography.Xml. A fix is available for System.Security.Cryptography.Xml — see the affected versions and patch details below.
.NET Information Disclosure Vulnerability
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-vh55-786g-wjwj.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-vh55-786g-wjwj plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,166 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
System.Security.Cryptography.Xml.NETSystem.Security.Cryptography.Xml.NETMicrosoft.AspNetCore.App.Runtime.win-x64.NETMicrosoft.AspNetCore.App.Runtime.win-x64.NETMicrosoft.AspNetCore.App.Runtime.linux-x64.NETMicrosoft.AspNetCore.App.Runtime.linux-x64.NETMicrosoft.AspNetCore.App.Runtime.win-x86.NETMicrosoft.AspNetCore.App.Runtime.win-x86+17 moreReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.
Description
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET Core 3.1 and .NET 6.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
An information disclosure vulnerability exists in .NET Core 3.1 and .NET 6.0 that could lead to unauthorized access of privileged information.
<a name="affected-software"></a>Affected software
- Any .NET 6.0 application running on .NET 6.0.7 or earlier.
- Any .NET Core 3.1 applicaiton running on .NET Core 3.1.27 or earlier.
If your application uses the following package versions, ensure you update to the latest version of .NET.
<a name=".NET Core 3.1"></a>.NET Core 3.1
| Package name | Affected version | Patched version |
|---|---|---|
| System.Security.Cryptography.Xml | <=4.7.0 | 4.7.1 |
| Microsoft.AspNetCore.App.Runtime.win-x64 | >=3.1.0, 3.1.27 | 3.1.28 |
| Microsoft.AspNetCore.App.Runtime.linux-x64 | >=3.1.0, 3.1.27 | 3.1.28 |
| Microsoft.AspNetCore.App.Runtime.win-x86 | >=3.1.0, 3.1.27 | 3.1.28 |
| Microsoft.AspNetCore.App.Runtime.osx-x64 | >=3.1.0, 3.1.27 | 3.1.28 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >=3.1.0, 3.1.27 | 3.1.28 |
| Microsoft.AspNetCore.App.Runtime.linux-arm64 | >=3.1.0, 3.1.27 | 3.1.28 |
| Microsoft.AspNetCore.App.Runtime.linux-arm | >=3.1.0, 3.1.27 | 3.1.28 |
| Microsoft.AspNetCore.App.Runtime.win-arm64 | >=3.1.0, 3.1.27 | 3.1.28 |
| Microsoft.AspNetCore.App.Runtime.win-arm | >=3.1.0, 3.1.27 | 3.1.28 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >=3.1.0, 3.1.27 | 3.1.28 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >=3.1.0, 3.1.27 | 3.1.28 |
<a name=".NET 6"></a>.NET 6
| Package name | Affected version | Patched version |
|---|---|---|
| System.Security.Cryptography.Xml | >=5.0.0, 6.0.0 | 6.0.1 |
| Microsoft.AspNetCore.App.Runtime.win-x64 | >=6.0.0, 6.0.7 | 6.0.8 |
| Microsoft.AspNetCore.App.Runtime.linux-x64 | >=6.0.0, 6.0.7 | 6.0.8 |
| Microsoft.AspNetCore.App.Runtime.win-x86 | >=6.0.0, 6.0.7 | 6.0.8 |
| Microsoft.AspNetCore.App.Runtime.osx-x64 | >=6.0.0, 6.0.7 | 6.0.8 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >=6.0.0, 6.0.7 | 6.0.8 |
| Microsoft.AspNetCore.App.Runtime.linux-arm64 | >=6.0.0, 6.0.7 | 6.0.8 |
| Microsoft.AspNetCore.App.Runtime.linux-arm | >=6.0.0, 6.0.7 | 6.0.8 |
| Microsoft.AspNetCore.App.Runtime.win-arm64 | >=6.0.0, 6.0.7 | 6.0.8 |
| Microsoft.AspNetCore.App.Runtime.win-arm | >=6.0.0, 6.0.7 | 6.0.8 |
| Microsoft.AspNetCore.App.Runtime.osx-arm64 | >=6.0.0, 6.0.7 | 6.0.8 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >=6.0.0, 6.0.7 | 6.0.8 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >=6.0.0, 6.0.7 | 6.0.8 |
Patches
- If you're using .NET 6.0, you should download and install Runtime 6.0.8 or SDK 6.0.108 (for Visual Studio 2022 v17.1) from https://dotnet.microsoft.com/download/dotnet-core/6.0.
- If you're using .NET Core 3.1, you should download and install Runtime 3.1.28 (for Visual Studio 2019 v16.9) from https://dotnet.microsoft.com/download/dotnet-core/3.1.
Other
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/232 An Issue for this can be found at https://github.com/dotnet/aspnetcore/issues/43166 MSRC details for this can be found at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-34716
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | System.Security.Cryptography.Xml | all versions | 4.7.1dotnet add package System.Security.Cryptography.Xml --version 4.7.1 |
| .NETNuGet | System.Security.Cryptography.Xml | ≥ 5.0.0&&< 6.0.1 | 6.0.1dotnet add package System.Security.Cryptography.Xml --version 6.0.1 |
| .NETNuGet | Microsoft.AspNetCore.App.Runtime.win-x64 | ≥ 3.1.0&&< 3.1.28 | 3.1.28dotnet add package Microsoft.AspNetCore.App.Runtime.win-x64 --version 3.1.28 |
| .NETNuGet | Microsoft.AspNetCore.App.Runtime.win-x64 | ≥ 6.0.0&&< 6.0.8 | 6.0.8dotnet add package Microsoft.AspNetCore.App.Runtime.win-x64 --version 6.0.8 |
| .NETNuGet | Microsoft.AspNetCore.App.Runtime.linux-x64 | ≥ 3.1.0&&< 3.1.28 | 3.1.28dotnet add package Microsoft.AspNetCore.App.Runtime.linux-x64 --version 3.1.28 |
| .NETNuGet | Microsoft.AspNetCore.App.Runtime.linux-x64 | ≥ 6.0.0&&< 6.0.8 | 6.0.8dotnet add package Microsoft.AspNetCore.App.Runtime.linux-x64 --version 6.0.8 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for System.Security.Cryptography.Xml, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update System.Security.Cryptography.Xml to 4.7.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-vh55-786g-wjwj is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-vh55-786g-wjwj can be triaged on real exposure rather than presence alone.
Tailored to GHSA-vh55-786g-wjwj. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
| Product | Fixed in | Advisory |
|---|---|---|
| .NET Core on Red Hat Enterprise Linux | rh-dotnet31-dotnet-0:3.1.422-1.el7_9 | RHSA-2022:6037 |
| .NET Core on Red Hat Enterprise Linux | rh-dotnet60-dotnet-0:6.0.108-1.el7_9 | RHSA-2022:6038 |
| Red Hat Enterprise Linux 8 | dotnet3.1-0:3.1.422-1.el8_6 | RHSA-2022:6057 |
| Red Hat Enterprise Linux 8 | dotnet6.0-0:6.0.108-1.el8_6 | RHSA-2022:6058 |
| Red Hat Enterprise Linux 9 | dotnet6.0-0:6.0.108-1.el9_0 | RHSA-2022:6043 |
Frequently Asked Questions
Is GHSA-vh55-786g-wjwj in your dependencies?
O3 Security finds GHSA-vh55-786g-wjwj across NuGet dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.