{"id":"CVE-2026-54776","state":"PUBLISHED","title":"CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the security upgrade","description":"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.","publishedAt":"2026-07-08T22:04:39.200Z","updatedAt":"2026-07-09T12:56:16.584Z","severity":{"score":4.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["CoreWCF CoreWCF"],"affected":[{"vendor":"CoreWCF","product":"CoreWCF","versions":[{"version":">= 1.9.0, < 1.9.1","status":"affected"},{"version":"< 1.8.1","status":"affected"}]}],"references":["https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-wjpq-6766-7f5j","https://github.com/CoreWCF/CoreWCF/commit/994431268e3362c0cd126450fe2a135c202551f3","https://github.com/CoreWCF/CoreWCF/commit/9af16955e51a57348dafce0019e259a092ef7440","https://github.com/CoreWCF/CoreWCF/commit/f2f1a05927a88b8a75fa0582fa8ed75eb891e463","https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1","https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1"],"weaknesses":["CWE-306"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54776.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54776","state":"PUBLISHED","datePublished":"2026-07-08T22:04:39.200Z","dateUpdated":"2026-07-09T12:56:16.584Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-15T23:23:57.713Z"},"containers":{"cna":{"title":"CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the security upgrade","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, 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."}],"affected":[{"vendor":"CoreWCF","product":"CoreWCF","versions":[{"version":">= 1.9.0, < 1.9.1","status":"affected"},{"version":"< 1.8.1","status":"affected"}]}],"references":[{"url":"https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-wjpq-6766-7f5j","name":"https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-wjpq-6766-7f5j","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/CoreWCF/CoreWCF/commit/994431268e3362c0cd126450fe2a135c202551f3","name":"https://github.com/CoreWCF/CoreWCF/commit/994431268e3362c0cd126450fe2a135c202551f3","tags":["x_refsource_MISC"]},{"url":"https://github.com/CoreWCF/CoreWCF/commit/9af16955e51a57348dafce0019e259a092ef7440","name":"https://github.com/CoreWCF/CoreWCF/commit/9af16955e51a57348dafce0019e259a092ef7440","tags":["x_refsource_MISC"]},{"url":"https://github.com/CoreWCF/CoreWCF/commit/f2f1a05927a88b8a75fa0582fa8ed75eb891e463","name":"https://github.com/CoreWCF/CoreWCF/commit/f2f1a05927a88b8a75fa0582fa8ed75eb891e463","tags":["x_refsource_MISC"]},{"url":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1","name":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1","tags":["x_refsource_MISC"]},{"url":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1","name":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":4.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-306","lang":"en","description":"CWE-306: Missing Authentication for Critical Function","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-08T22:04:39.200Z"},"source":{"advisory":"GHSA-wjpq-6766-7f5j","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-09T12:56:10.364263Z","id":"CVE-2026-54776","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-09T12:56:16.584Z"}}]}}}