Medium severity4.4NVD Advisory· Published Jul 8, 2026· Updated Jul 9, 2026
CVE-2026-54776
CVE-2026-54776
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
CoreWCF.UnixDomainSocketNuGet | < 1.8.1 | 1.8.1 |
CoreWCF.UnixDomainSocketNuGet | >= 1.9.0, < 1.9.1 | 1.9.1 |
Affected products
1Patches
Vulnerability mechanics
References
7- github.com/advisories/GHSA-wjpq-6766-7f5jghsaADVISORY
- github.com/CoreWCF/CoreWCF/security/advisories/GHSA-wjpq-6766-7f5jnvdWEB
- github.com/CoreWCF/CoreWCF/commit/994431268e3362c0cd126450fe2a135c202551f3nvd
- github.com/CoreWCF/CoreWCF/commit/9af16955e51a57348dafce0019e259a092ef7440nvd
- github.com/CoreWCF/CoreWCF/commit/f2f1a05927a88b8a75fa0582fa8ed75eb891e463nvd
- github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1nvd
- github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1nvd
News mentions
1- CoreWCF: 13 CVEs Disclosed in a Single Day — Critical SAML Bypass and WS-Security FlawsVypr Intelligence · Jun 19, 2026