{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.9.0"
              },
              {
                "fixed": "1.9.1"
              },
              {
                "introduced": "0"
              },
              {
                "fixed": "1.8.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "39b2f02978e497955a560c72b5ccdff5c0dbcda1"
            },
            {
              "introduced": "0"
            },
            {
              "fixed": "1f7a0811da5128db40fd7b868ae0aac0c581f91f"
            },
            {
              "fixed": "7c0920fe16adc497efae82881ac0f1e4d7ac98d0"
            },
            {
              "fixed": "994431268e3362c0cd126450fe2a135c202551f3"
            },
            {
              "fixed": "9af16955e51a57348dafce0019e259a092ef7440"
            },
            {
              "fixed": "f2f1a05927a88b8a75fa0582fa8ed75eb891e463"
            }
          ],
          "repo": "https://github.com/corewcf/corewcf",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-wjpq-6766-7f5j"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-306"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54776.json"
  },
  "details": "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, a CoreWCF service hosted on Unix Domain Sockets with PosixIdentity client credentials can accept connections that skip the application/unixposix stream upgrade before dispatching messages, bypassing framing-layer identity checks in UnixPosixIdentitySecurityUpgradeProvider. This issue is fixed in versions 1.8.1 and 1.9.1.",
  "id": "CVE-2026-54776",
  "modified": "2026-07-15T01:48:54.600524170Z",
  "published": "2026-07-08T22:04:39.200Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54776.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-wjpq-6766-7f5j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54776"
    },
    {
      "type": "FIX",
      "url": "https://github.com/CoreWCF/CoreWCF/commit/994431268e3362c0cd126450fe2a135c202551f3"
    },
    {
      "type": "FIX",
      "url": "https://github.com/CoreWCF/CoreWCF/commit/9af16955e51a57348dafce0019e259a092ef7440"
    },
    {
      "type": "FIX",
      "url": "https://github.com/CoreWCF/CoreWCF/commit/f2f1a05927a88b8a75fa0582fa8ed75eb891e463"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the security upgrade"
}