Vulnerability-Lookup

GHSA-Q6V9-43V5-JV9Q

Vulnerability from github – Published: 2026-06-19 20:46 – Updated: 2026-06-19 20:46

Summary

CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution

Details

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.

Severity

6.2 (Medium)


                  
                    CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "CoreWCF.UnixDomainSocket"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "CoreWCF.UnixDomainSocket"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.9.0"
            },
            {
              "fixed": "1.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54778"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362",
      "CWE-825"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-19T20:46:58Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\nRace condition in POSIX peer identity resolution may attribute one connection\u2019s 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.",
  "id": "GHSA-q6v9-43v5-jv9q",
  "modified": "2026-06-19T20:46:58Z",
  "published": "2026-06-19T20:46:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-q6v9-43v5-jv9q"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/CoreWCF/CoreWCF"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution"
}

CVE-2026-54778 (GCVE-0-2026-54778)

Vulnerability from cvelistv5 – Published: 2026-07-08 22:11 – Updated: 2026-07-09 13:23

Title

CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution

Summary

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, CoreWCF UnixDomainSocket POSIX peer identity resolution uses non-reentrant getpwuid and getgrgid calls, allowing concurrent connections to attribute one connection's identity to another or crash the host process under contention. This issue is fixed in versions 1.8.1 and 1.9.1.

Severity

6.2 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-825 - Expired Pointer Dereference

Assigner

GitHub_M

References

6 references

URL	Tags
https://github.com/CoreWCF/CoreWCF/security/advis…	x_refsource_CONFIRM
https://github.com/CoreWCF/CoreWCF/commit/a3d95ea…	x_refsource_MISC
https://github.com/CoreWCF/CoreWCF/commit/b0acb10…	x_refsource_MISC
https://github.com/CoreWCF/CoreWCF/commit/b486754…	x_refsource_MISC
https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1	x_refsource_MISC
https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
CoreWCF	CoreWCF	Affected: >= 1.9.0, < 1.9.1 Affected: < 1.8.1

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-54778",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-09T13:22:50.639287Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-09T13:23:29.922Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "CoreWCF",
          "vendor": "CoreWCF",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.9.0, \u003c 1.9.1"
            },
            {
              "status": "affected",
              "version": "\u003c 1.8.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, CoreWCF UnixDomainSocket POSIX peer identity resolution uses non-reentrant getpwuid and getgrgid calls, allowing concurrent connections to attribute one connection\u0027s identity to another or crash the host process under contention. This issue is fixed in versions 1.8.1 and 1.9.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.2,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-362",
              "description": "CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-825",
              "description": "CWE-825: Expired Pointer Dereference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-08T22:12:11.923Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
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          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-q6v9-43v5-jv9q"
        },
        {
          "name": "https://github.com/CoreWCF/CoreWCF/commit/a3d95ea4627b818995e92c7def4c016164cacfce",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/CoreWCF/CoreWCF/commit/a3d95ea4627b818995e92c7def4c016164cacfce"
        },
        {
          "name": "https://github.com/CoreWCF/CoreWCF/commit/b0acb105589b455a095ea5ff49f5191e4eeff791",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/CoreWCF/CoreWCF/commit/b0acb105589b455a095ea5ff49f5191e4eeff791"
        },
        {
          "name": "https://github.com/CoreWCF/CoreWCF/commit/b4867547c94bb088568935d581a55dda18a621e1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/CoreWCF/CoreWCF/commit/b4867547c94bb088568935d581a55dda18a621e1"
        },
        {
          "name": "https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1"
        },
        {
          "name": "https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1"
        }
      ],
      "source": {
        "advisory": "GHSA-q6v9-43v5-jv9q",
        "discovery": "UNKNOWN"
      },
      "title": "CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54778",
    "datePublished": "2026-07-08T22:11:55.490Z",
    "dateReserved": "2026-06-15T23:23:57.714Z",
    "dateUpdated": "2026-07-09T13:23:29.922Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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