Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/CoreWCF/CoreWCF/commit/994431268e3362c0cd126450fe2a135c202551
- https://github.com/CoreWCF/CoreWCF/commit/9af16955e51a57348dafce0019e259a092ef74
- https://github.com/CoreWCF/CoreWCF/commit/f2f1a05927a88b8a75fa0582fa8ed75eb891e4
- https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1
- https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1
- https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-wjpq-6766-7f5j
FAQ
What is CVE-2026-54776?
CVE-2026-54776 is a vulnerability with a CVSS score of 4.4 (MEDIUM). 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 creden...
How severe is CVE-2026-54776?
CVE-2026-54776 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54776?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.