CVE-2026-54777 — CoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance
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 pr…
Published: 2026-07-08 · CVSS: 6.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7