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

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Summary

CVECVE-2026-54776
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 23:16:55 UTC
Updated2026-07-08 23:16:55 UTC
DescriptionCoreWCF 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.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Problem Types: CWE-306 | CWE-306 CWE-306: Missing Authentication for Critical Function

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
3.1CNADECLARED4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA CoreWCF CoreWCF affected >= 1.9.0, < 1.9.1 Not specified
CNA CoreWCF CoreWCF affected < 1.8.1 Not specified

References

ReferenceSourceLinkTags
github.com/CoreWCF/CoreWCF/commit/9af16955e51a57348dafce0019e259a092ef7440 [email protected] github.com
github.com/CoreWCF/CoreWCF/commit/994431268e3362c0cd126450fe2a135c202551f3 [email protected] github.com
github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1 [email protected] github.com
github.com/CoreWCF/CoreWCF/security/advisories/GHSA-wjpq-6766-7f5j [email protected] github.com
github.com/CoreWCF/CoreWCF/commit/f2f1a05927a88b8a75fa0582fa8ed75eb891e463 [email protected] github.com
github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1 [email protected] github.com
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