CVE-2026-54776Medium· 4.4▾ SunlitCoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the security upgrade
▾ Sunlit zone — Low / medium · no exploitation signal
impact 24.2 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.1%
0.1% → 0.2%
A CoreWCF service hosted on Unix Domain Sockets with the PosixIdentity client credential type (UnixDomainSocketBinding with Security.Mode = TransportCredentialOnly and Security.Transport.ClientCredentialType = PosixIdentity) does not require the client to perform the application/unixposix stream upgrade before dispatching messages.
Fixed in CoreWCF v1.8.1 and v1.9.1
Restrict filesystem access to the UDS socket file using owner/group/mode (e.g. chmod 0660 plus a dedicated group) so that only the POSIX users who are already authorized to invoke the service can connect at all. This makes the missing-upgrade behaviour equivalent to the operating system’s filesystem permissions instead of relying on framing-layer identity checks. Avoid relying on ServiceSecurityContext.PrimaryIdentity for authorization decisions, or back it up with an authentication-required authorization policy that rejects anonymous principals.
CoreWCF.UnixDomainSocket < 1.8.1CoreWCF.UnixDomainSocket >= 1.9.0, < 1.9.1Upgrade to a patched release:
CoreWCF.UnixDomainSocket 1.8.1CoreWCF.UnixDomainSocket 1.9.1Connected by shared product, vendor, weakness, or advisory.
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