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CVE-2026-54778— CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution

CVSS 6.2 · Medium

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-54778

Vulnerability Information
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Vulnerability Title
CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution
Source: NVD (National Vulnerability Database)
Vulnerability 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, CoreWCF UnixDomainSocket POSIX peer identity resolution uses non-reentrant getpwuid and getgrgid calls, allowing concurrent connections to attribute one connection's identity to another or crash the host process under contention. This issue is fixed in versions 1.8.1 and 1.9.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
CoreWCFCoreWCF >= 1.9.0, < 1.9.1 -

II. Public POCs for CVE-2026-54778

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III. Intelligence Information for CVE-2026-54778

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Patches & Fixes for CVE-2026-54778 (3)

Vendor Advisories for CVE-2026-54778 (1)

Vendor Pages for CVE-2026-54778 (1)

Other References for CVE-2026-54778 (1)

Same Patch Batch · CoreWCF · 2026-07-08 · 13 CVEs total

CVE-2026-5478210.0 CRITICALCoreWCF: Authentication bypass in CoreWCF SAML 1.1 / 2.0 token signature validation
CVE-2026-547727.5 HIGHCoreWCF: Pre-authentication infinite-loop CPU exhaustion in CoreWCF net.tcp / net.pipe / n
CVE-2026-547837.4 HIGHCoreWCF: XML Signature Wrapping in WS-Security endorsing/supporting signature verification
CVE-2026-547747.4 HIGHCoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not a
CVE-2026-547817.4 HIGHCoreWCF: SAML SubjectConfirmation methods and holder-of-key proof keys are not enforced
CVE-2026-547847.4 HIGHCoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality
CVE-2026-547756.5 MEDIUMCoreWCF: Kafka consume pump halts permanently on a Kafka tombstone (null-value record), ca
CVE-2026-547776.5 MEDIUMCoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance
CVE-2026-547795.9 MEDIUMCoreWCF: SAML token replay protection is inoperative
CVE-2026-547735.9 MEDIUMCoreWCF: WS-Security signature substitution via document-wide Signature lookup
CVE-2026-547764.4 MEDIUMCoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the secu
CVE-2026-547803.7 LOWCoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass

IV. Related Vulnerabilities

Same product: CoreWCF
Same vendor: CoreWCF
Same weakness: CWE-362

V. Comments for CVE-2026-54778

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