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    CVE-2026-54777

    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 NetNamedPipe transport accepts attachment to a pre-existing named pipe instance, allowing local interception of NetNamedPipe traffic when an attacker races NamedPipeListener startup between shared memory GUID publication and service named pipe creation. This issue is fixed in versions 1.8.1 and 1.9.1.

    Published:Jul 8, 2026
    Last Modified:Jul 10, 2026
    EPS:Jul 8, 2026
    EPSS Score:0.00088
    CVSS Score:6.5

    Affected Products

    Vendor
    Corewcf
    Product
    Corewcf

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-54782 (CVSS 10) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54781 (CVSS 7.4) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54784 (CVSS 7.4) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. In version 1.9.0…
    CVE-2026-54774 (CVSS 7.4) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54783 (CVSS 7.4) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54780 (CVSS 3.7) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54775 (CVSS 6.5) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54778 (CVSS 6.2) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54773 (CVSS 5.9) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54779 (CVSS 5.9) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High