GHSA-387c-qmrw-59qv: Duplicate Advisory Microsoft Security Advisory CVE-2026-26131 – Vulnerability

HIGH
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CVSS 7.8
CWE-276
Published
Advisory Summary

GHSA-387c-qmrw-59qv is a HIGH (CVSS 7.8) microsoft security advisory cve-2026-26131 – vulnerability (CWE-276: Incorrect Default Permissions) affecting Duplicate Advisory libraries in the NuGet ecosystem. The issue involves microsoft security advisory cve-2026-26131 – .net elevation of privilege vulnerability. Remediation is available by upgrading affected packages to version 10.0.4.

GHSA-387c-qmrw-59qv at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-387c-qmrw-59qv
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-276: Incorrect Default Permissions
Affected Product Duplicate Advisory
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 7.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix GHSA-387c-qmrw-59qv

To remediate this vulnerability, upgrade all affected Duplicate Advisory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Microsoft.NetCore.App.Runtime.linux-arm fixed: 10.0.4 
Upgrade Microsoft.NetCore.App.Runtime.linux-arm to 10.0.4
Microsoft.NetCore.App.Runtime.linux-arm64 fixed: 10.0.4 
Upgrade Microsoft.NetCore.App.Runtime.linux-arm64 to 10.0.4
Microsoft.NetCore.App.Runtime.linux-musl-arm fixed: 10.0.4 
Upgrade Microsoft.NetCore.App.Runtime.linux-musl-arm to 10.0.4
Microsoft.NetCore.App.Runtime.linux-musl-arm64 fixed: 10.0.4 
Upgrade Microsoft.NetCore.App.Runtime.linux-musl-arm64 to 10.0.4
Microsoft.NetCore.App.Runtime.linux-musl-x64 fixed: 10.0.4 
Upgrade Microsoft.NetCore.App.Runtime.linux-musl-x64 to 10.0.4
Microsoft.NetCore.App.Runtime.linux-x64 fixed: 10.0.4 
Upgrade Microsoft.NetCore.App.Runtime.linux-x64 to 10.0.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for Microsoft.NetCore.App.Runtime.linux-arm

How to Check if You Are Affected

To determine whether your application is affected by GHSA-387c-qmrw-59qv, inspect your project dependencies for Duplicate Advisory:

inspect dependencies for Microsoft.NetCore.App.Runtime.linux-arm

Analyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 10.0.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-276: Incorrect Default Permissions, where during installation, installed file permissions are set to allow anyone to modify those files. In Duplicate Advisory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-crjq-wm6x-6qx7. This link is maintained to preserve external references. ### Original Description Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.

GHSA-387c-qmrw-59qv Affected Duplicate Advisory Versions

6 component(s)
Fixed Versions:
10.0.4
Product / Package Ecosystem Affected Versions Fixed Version
Microsoft.NetCore.App.Runtime.linux-arm
nuget/Microsoft.NetCore.App.Runtime.linux-arm
NuGet
≥ 10.0.0
< 10.0.4
10.0.4
Microsoft.NetCore.App.Runtime.linux-arm64
nuget/Microsoft.NetCore.App.Runtime.linux-arm64
NuGet
≥ 10.0.0
< 10.0.4
10.0.4
Microsoft.NetCore.App.Runtime.linux-musl-arm
nuget/Microsoft.NetCore.App.Runtime.linux-musl-arm
NuGet
≥ 10.0.0
< 10.0.4
10.0.4
Microsoft.NetCore.App.Runtime.linux-musl-arm64
nuget/Microsoft.NetCore.App.Runtime.linux-musl-arm64
NuGet
≥ 10.0.0
< 10.0.4
10.0.4
Microsoft.NetCore.App.Runtime.linux-musl-x64
nuget/Microsoft.NetCore.App.Runtime.linux-musl-x64
NuGet
≥ 10.0.0
< 10.0.4
10.0.4
Microsoft.NetCore.App.Runtime.linux-x64
nuget/Microsoft.NetCore.App.Runtime.linux-x64
NuGet
≥ 10.0.0
< 10.0.4
10.0.4

References

NVD — GHSA-387c-qmrw-59qv NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26131
Duplicate Advisory Source Repository REPOSITORY
https://github.com/dotnet/dotnet
msrc.microsoft.com/update-guide/vulner... WEB
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26131

Frequently Asked Questions

What is GHSA-387c-qmrw-59qv?
GHSA-387c-qmrw-59qv is a security vulnerability in Duplicate Advisory involving Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability under CWE-276: Incorrect Default Permissions.
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to 10.0.4 across affected packages: Microsoft.NetCore.App.Runtime.linux-arm, Microsoft.NetCore.App.Runtime.linux-arm64, Microsoft.NetCore.App.Runtime.linux-musl-arm, Microsoft.NetCore.App.Runtime.linux-musl-arm64, Microsoft.NetCore.App.Runtime.linux-musl-x64, Microsoft.NetCore.App.Runtime.linux-x64.
What version fixes GHSA-387c-qmrw-59qv?
Upgrading to 10.0.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Microsoft.NetCore.App.Runtime.linux-arm affected?
Yes, Microsoft.NetCore.App.Runtime.linux-arm is affected in releases prior to 10.0.4. Upgrade your dependency to 10.0.4 or later.
Is Microsoft.NetCore.App.Runtime.linux-arm64 affected?
Yes, Microsoft.NetCore.App.Runtime.linux-arm64 is affected in releases prior to 10.0.4. Upgrade your dependency to 10.0.4 or later.
What is the CVSS score of GHSA-387c-qmrw-59qv?
GHSA-387c-qmrw-59qv has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with GHSA-387c-qmrw-59qv?
GHSA-387c-qmrw-59qv is classified under CWE-276: Incorrect Default Permissions (During installation, installed file permissions are set to allow anyone to modify those files.).
How can I check NuGet dependencies for GHSA-387c-qmrw-59qv?
Run the dependency tree command: 'inspect dependencies for Microsoft.NetCore.App.Runtime.linux-arm'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-387c-qmrw-59qv",
  "modified" : "2026-03-11T18:54:29Z",
  "published" : "2026-03-10T18:31:21Z",
  "withdrawn" : "2026-03-11T18:54:29Z",
  "aliases" : [ ],
  "summary" : "Duplicate Advisory: Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability",
  "details" : "### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-crjq-wm6x-6qx7. This link is maintained to preserve external references.\n\n### Original Description\n\nIncorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.NetCore.App.Runtime.linux-arm"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0"
      }, {
        "fixed" : "10.0.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 10.0.3"
    }
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.NetCore.App.Runtime.linux-arm64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0"
      }, {
        "fixed" : "10.0.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 10.0.3"
    }
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.NetCore.App.Runtime.linux-musl-arm"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0"
      }, {
        "fixed" : "10.0.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 10.0.3"
    }
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.NetCore.App.Runtime.linux-musl-arm64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0"
      }, {
        "fixed" : "10.0.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 10.0.3"
    }
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.NetCore.App.Runtime.linux-musl-x64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0"
      }, {
        "fixed" : "10.0.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 10.0.3"
    }
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.NetCore.App.Runtime.linux-x64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0"
      }, {
        "fixed" : "10.0.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 10.0.3"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-26131"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/dotnet/dotnet"
  }, {
    "type" : "WEB",
    "url" : "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26131"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-276" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-11T18:54:29Z",
    "nvd_published_at" : "2026-03-10T18:18:42Z"
  }
}