GHSA-wjpq-6766-7f5j

Source

https://github.com/advisories/GHSA-wjpq-6766-7f5j

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-wjpq-6766-7f5j/GHSA-wjpq-6766-7f5j.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-wjpq-6766-7f5j

Aliases

CVE-2026-54776

Published

2026-06-19T20:46:52Z

Modified

2026-06-19T21:00:17.170216639Z

Severity

4.4 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N CVSS Calculator

Summary

CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the security upgrade

Details

Impact

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.

Patches

Fixed in CoreWCF v1.8.1 and v1.9.1

Workarounds

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.

Database specific

{
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-19T20:46:52Z",
    "nvd_published_at": null,
    "severity": "MODERATE",
    "cwe_ids": [
        "CWE-306"
    ]
}

References

Affected packages

NuGet / CoreWCF.UnixDomainSocket

Package

Name: CoreWCF.UnixDomainSocket; View open source insights on deps.dev
Purl: pkg:nuget/CoreWCF.UnixDomainSocket

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.8.1

Affected versions

1.*

1.5.0-preview1

1.5.0

1.5.1

1.5.2

1.6.0

1.7.0

1.8.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-wjpq-6766-7f5j/GHSA-wjpq-6766-7f5j.json"