Vulnerabilities in pkg:nuget/CoreWCF.UnixDomainSocket

PACKAGE
Advisory Identifier: GHSA-q6v9-43v5-jv9q
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Advisory Summary

CVE-2026-54778 is a MODERATE (CVSS 6.2) unixdomainsocket non-reentrant posix identity resolution vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting CoreWCF libraries in the NuGet ecosystem. The issue involves unixdomainsocket non-reentrant posix identity resolution. Remediation is available by upgrading affected packages to version 1.8.1, 1.9.1.

2 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:nuget/CoreWCF.UnixDomainSocket

2 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:nuget/CoreWCF.UnixDomainSocket. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-q6v9-43v5-jv9q CVE-2026-54778 MODERATE CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution
GHSA-wjpq-6766-7f5j CVE-2026-54776 MODERATE CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the security upgrade

CVE-2026-54778 at a Glance

CVE Identifier CVE-2026-54778
GHSA Identifier GHSA-q6v9-43v5-jv9q
Severity MODERATE
CVSS v3.1 Base Score 6.2
CWE Classification CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Product CoreWCF
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 6.2

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

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

How to Fix CVE-2026-54778

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

CoreWCF.UnixDomainSocket fixed: 1.8.1 
Upgrade CoreWCF.UnixDomainSocket to 1.8.1
CoreWCF.UnixDomainSocket fixed: 1.9.1 
Upgrade CoreWCF.UnixDomainSocket to 1.9.1
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 CoreWCF.UnixDomainSocket

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-54778, inspect your project dependencies for CoreWCF:

inspect dependencies for CoreWCF.UnixDomainSocket

Analyze the terminal output to locate any version of CoreWCF in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.8.1), 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-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), where the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. In CoreWCF, 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

### Impact Race condition in POSIX peer identity resolution may attribute one connection’s identity to another (getpwuid/getgrgid non-reentrant) and may crash the host process under contention. ### Patches Fixed in CoreWCF v1.8.1 and v1.9.1 ### Workarounds Restrict UDS filesystem permissions so that only trusted local users can connect to the socket path. The race still exists but the attacker pool is constrained.

CVE-2026-54778 Affected CoreWCF Versions

2 component(s)
Fixed Versions:
1.8.11.9.1
Product / Package Ecosystem Affected Versions Fixed Version
CoreWCF.UnixDomainSocket
nuget/CoreWCF.UnixDomainSocket
NuGet
< 1.8.1
1.8.1
CoreWCF.UnixDomainSocket
nuget/CoreWCF.UnixDomainSocket
NuGet
≥ 1.9.0
< 1.9.1
1.9.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-q6v9-43v5-jv9q
CoreWCF Source Repository REPOSITORY
https://github.com/CoreWCF/CoreWCF

Frequently Asked Questions

What is CVE-2026-54778?
CVE-2026-54778 is a security vulnerability in CoreWCF involving UnixDomainSocket Non-Reentrant POSIX Identity Resolution under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which CoreWCF versions are affected?
Affected versions include releases prior to 1.8.1, 1.9.1 across affected packages: CoreWCF.UnixDomainSocket.
What version fixes CVE-2026-54778?
Upgrading to 1.8.1, 1.9.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is CoreWCF.UnixDomainSocket affected?
Yes, CoreWCF.UnixDomainSocket is affected in releases prior to 1.8.1, 1.9.1. Upgrade your dependency to 1.8.1, 1.9.1 or later.
What is the CVSS score of CVE-2026-54778?
CVE-2026-54778 has a CVSS v3.1 base score of 6.2 (MODERATE) with vector string CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H.
What CWE is associated with CVE-2026-54778?
CVE-2026-54778 is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.).
How can I check NuGet dependencies for CVE-2026-54778?
Run the dependency tree command: 'inspect dependencies for CoreWCF.UnixDomainSocket'. 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-q6v9-43v5-jv9q",
  "modified" : "2026-06-19T20:46:58Z",
  "published" : "2026-06-19T20:46:58Z",
  "aliases" : [ "CVE-2026-54778" ],
  "summary" : "CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution",
  "details" : "### Impact\nRace condition in POSIX peer identity resolution may attribute one connection’s identity to another (getpwuid/getgrgid non-reentrant) and may crash the host process under contention.\n\n### Patches\nFixed in CoreWCF v1.8.1 and v1.9.1\n\n### Workarounds\nRestrict UDS filesystem permissions so that only trusted local users can connect to the socket path. The race still exists but the attacker pool is constrained.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "CoreWCF.UnixDomainSocket"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.8.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "CoreWCF.UnixDomainSocket"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.9.0"
      }, {
        "fixed" : "1.9.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-q6v9-43v5-jv9q"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/CoreWCF/CoreWCF"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-362", "CWE-825" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-19T20:46:58Z",
    "nvd_published_at" : null
  }
}