CVE-2026-54778
Published:June 19, 2026
Updated:June 21, 2026
Impact Race 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. Patches Fixed in CoreWCF v1.8.1 and v1.9.1 Workarounds Restrict 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.
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 (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.9
Attack Vector
LOCAL
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.2
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
HIGH