CVE-2026-54776
Medium
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.
SeverityMedium
CVSS4.4
Exploit probability—
ProductCorewcf.unixdomainsocket
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-306Missing authentication for critical function
How to fix
Update
- CoreWCF.UnixDomainSocket1.8.1, 1.9.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| CoreWCF.UnixDomainSocketNuGet | v < 1.8.1, 1.9.0 ≤ v < 1.9.1 | 1.8.1, 1.9.1 |
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