{"id":"GHSA-q6v9-43v5-jv9q","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.","aliases":["CVE-2026-54778"],"modified":"2026-06-19T21:11:30.078930Z","published":"2026-06-19T20:46:58Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-362","CWE-825"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"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"}],"affected":[{"package":{"name":"CoreWCF.UnixDomainSocket","ecosystem":"NuGet","purl":"pkg:nuget/CoreWCF.UnixDomainSocket"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.1"}]}],"versions":["1.5.0","1.5.0-preview1","1.5.1","1.5.2","1.6.0","1.7.0","1.8.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-q6v9-43v5-jv9q/GHSA-q6v9-43v5-jv9q.json"}},{"package":{"name":"CoreWCF.UnixDomainSocket","ecosystem":"NuGet","purl":"pkg:nuget/CoreWCF.UnixDomainSocket"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.9.0"},{"fixed":"1.9.1"}]}],"versions":["1.9.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-q6v9-43v5-jv9q/GHSA-q6v9-43v5-jv9q.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H"}]}