CVE-2026-54777
Medium
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 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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductCorewcf.netnamedpipe
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-367CWE-367CWE-665CWE-665
How to fix
Update
- CoreWCF.NetNamedPipe1.8.1, 1.9.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| CoreWCF.NetNamedPipeNuGet | v < 1.8.1, 1.9.0 ≤ v < 1.9.1 | 1.8.1, 1.9.1 |
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