CVE-2026-54776

MEDIUM

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

Title source: cna
STIX 2.1

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.

References (6)

Core 6

Scores

CVSS v3 4.4
EPSS 0.0011
EPSS Percentile 1.5%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-306
Status published
Products (2)
CoreWCF/CoreWCF < 1.8.1
CoreWCF/CoreWCF >= 1.9.0, < 1.9.1
Published Jul 08, 2026
Tracked Since Jul 09, 2026