CVE-2026-54777
CoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance
CVSS Score
6.5
EPSS Score
0.1%
EPSS Percentile
1th
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.
| CWE | CWE-367 CWE-665 |
| Vendor | corewcf |
| Product | corewcf |
| Published | Jul 8, 2026 |
| Last Updated | Jul 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low
Affected Versions
CoreWCF / CoreWCF
>= 1.9.0, < 1.9.1 < 1.8.1
References
github.com: https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-6jj2-4q5c-x8g6 github.com: https://github.com/CoreWCF/CoreWCF/commit/8ed9c780c7c6fb22fa215c5771dee0c1e49596b7 github.com: https://github.com/CoreWCF/CoreWCF/commit/e7d225394fd429900dcbc445dcdd53b94e964077 github.com: https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1 github.com: https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1