CVE-2026-54776
Published:July 08, 2026
Updated:July 20, 2026
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 Packages
corewcf.unixdomainsocket (DOT_NET):
Affected version(s) >=1.5.0.3 <1.8.1Fix Suggestion:
Update to version 1.8.1https://github.com/CoreWCF/CoreWCF.git (GITHUB):
Affected version(s) =v1.9.0 <v1.9.1Fix Suggestion:
Update to version v1.9.1https://github.com/CoreWCF/CoreWCF.git (GITHUB):
Affected version(s) >=v1.5.0 <v1.8.1Fix Suggestion:
Update to version v1.8.1corewcf.unixdomainsocket (NUGET):
Affected version(s) =1.9.0 <1.9.1Fix Suggestion:
Update to version 1.9.1corewcf.unixdomainsocket (NUGET):
Affected version(s) >=1.5.0 <1.8.1Fix Suggestion:
Update to version 1.8.1Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
4.8
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.4
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Missing Authentication for Critical Function
EPSS
Base Score:
0.11