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dotnet · CoreWCF.NetNamedPipeHeads-up

CoreWCF.NetNamedPipe vulnerability: local interception of NetNamedPipe traffic fixed in v1.8.1 and v1.9.1

CoreWCF NetNamedPipe transport had a vulnerability allowing local interception of NetNamedPipe traffic by attaching to a pre-existing named pipe instance.

20 Jun 2026Read 1 minSeverity: schedule it

What changed

CoreWCF NetNamedPipe transport had a vulnerability allowing local interception of NetNamedPipe traffic by attaching to a pre-existing named pipe instance. Fixed in v1.8.1 and v1.9.1.

Who it affects

Users of CoreWCF NetNamedPipe transport on versions prior to 1.8.1 and 1.9.1.

What to do today

Update CoreWCF to version 1.8.1 or 1.9.1 to patch the vulnerability.

The trail
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