{"id":"CVE-2026-54776","summary":"CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the security upgrade","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.","aliases":["GHSA-wjpq-6766-7f5j"],"modified":"2026-07-15T01:48:54.600524170Z","published":"2026-07-08T22:04:39.200Z","database_specific":{"cwe_ids":["CWE-306"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54776.json","cna_assigner":"GitHub_M"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/corewcf/corewcf","events":[{"introduced":"39b2f02978e497955a560c72b5ccdff5c0dbcda1"},{"introduced":"0"},{"fixed":"1f7a0811da5128db40fd7b868ae0aac0c581f91f"},{"fixed":"7c0920fe16adc497efae82881ac0f1e4d7ac98d0"},{"fixed":"994431268e3362c0cd126450fe2a135c202551f3"},{"fixed":"9af16955e51a57348dafce0019e259a092ef7440"},{"fixed":"f2f1a05927a88b8a75fa0582fa8ed75eb891e463"}],"database_specific":{"extracted_events":[{"introduced":"1.9.0"},{"fixed":"1.9.1"},{"introduced":"0"},{"fixed":"1.8.1"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v1.8.0","v1.9.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54776.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"}]}