.NET Elevation of Privilege VulnerabilityGHSA-crjq-wm6x-6qx7
HIGHGHSA-crjq-wm6x-6qx7 is a high-severity (CVSS 7.8) Incorrect Default Permissions vulnerability in Microsoft.NetCore.App.Runtime.linux-arm. A fix is available for Microsoft.NetCore.App.Runtime.linux-arm — see the affected versions and patch details below.
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- 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-crjq-wm6x-6qx7.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
Microsoft.NetCore.App.Runtime.linux-arm.NETMicrosoft.NetCore.App.Runtime.linux-arm64.NETMicrosoft.NetCore.App.Runtime.linux-musl-arm.NETMicrosoft.NetCore.App.Runtime.linux-musl-arm64.NETMicrosoft.NetCore.App.Runtime.linux-musl-x64.NETMicrosoft.NetCore.App.Runtime.linux-x64Real-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 Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability
Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 10.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
An elevation of privilege vulnerability exists in .NET due to improper authorization. Incorrect packaging permissions could allow an attacker to gain elevated privileges.
Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/386
CVSS Details
- Severity: High
- Version: 3.1
- Score: 7.8
- Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness: CWE-276 (Incorrect Default Permissions)
Affected Platforms
- Platforms: Linux
- Architectures: All
Affected Products
<a name=".NET 10"></a>.NET 10
| Package name | Affected version | Patched version |
|---|---|---|
| Microsoft.NetCore.App.Runtime.linux-arm | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| Microsoft.NetCore.App.Runtime.linux-arm64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| Microsoft.NetCore.App.Runtime.linux-musl-arm | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| Microsoft.NetCore.App.Runtime.linux-musl-arm64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| Microsoft.NetCore.App.Runtime.linux-musl-x64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| Microsoft.NetCore.App.Runtime.linux-x64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
Advisory FAQ
<a name="how-affected"></a>How do I know if I am affected?
If using an affected package listed in affected products, 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 10.0. 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.
- If your application references the vulnerable 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
Igor Kovalchuk
Revisions
V1.0 (March 10, 2026): Advisory published.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | Microsoft.NetCore.App.Runtime.linux-arm | ≥ 10.0.0&&< 10.0.4 | 10.0.4dotnet add package Microsoft.NetCore.App.Runtime.linux-arm --version 10.0.4 |
| .NETNuGet | Microsoft.NetCore.App.Runtime.linux-arm64 | ≥ 10.0.0&&< 10.0.4 | 10.0.4dotnet add package Microsoft.NetCore.App.Runtime.linux-arm64 --version 10.0.4 |
| .NETNuGet | Microsoft.NetCore.App.Runtime.linux-musl-arm | ≥ 10.0.0&&< 10.0.4 | 10.0.4dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm --version 10.0.4 |
| .NETNuGet | Microsoft.NetCore.App.Runtime.linux-musl-arm64 | ≥ 10.0.0&&< 10.0.4 | 10.0.4dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm64 --version 10.0.4 |
| .NETNuGet | Microsoft.NetCore.App.Runtime.linux-musl-x64 | ≥ 10.0.0&&< 10.0.4 | 10.0.4dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-x64 --version 10.0.4 |
| .NETNuGet | Microsoft.NetCore.App.Runtime.linux-x64 | ≥ 10.0.0&&< 10.0.4 | 10.0.4dotnet add package Microsoft.NetCore.App.Runtime.linux-x64 --version 10.0.4 |
Affected Products
.netmicrosoftDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Microsoft.NetCore.App.Runtime.linux-arm, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update Microsoft.NetCore.App.Runtime.linux-arm to 10.0.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-crjq-wm6x-6qx7 is resolved across your whole dependency graph.
Workarounds
Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.
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.
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.Source: Red Hat security advisory for GHSA-crjq-wm6x-6qx7 (CC BY 4.0)
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Hardened Images | dotnet10-0-main-10.0.106-1.hum1 | RHSA-2026:9077 |
Frequently Asked Questions
Is GHSA-crjq-wm6x-6qx7 in your dependencies?
Find it across NuGet, including transitive dependencies.