CVE-2026-54776 — CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the security upgrade
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 Posi…
Published: 2026-07-08 · CVSS: 4.4 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7