VULNERABILITY INTELLIGENCE

CVE-2026-54777

CVSS score6.5 MEDIUM
EPSS probability0.12%
CISA KEVNot currently listed
Published2026-07-08
Last modified2026-07-10
CVSS vectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L

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.

Weakness classification

  • security-advisories@github.com: CWE-367

Primary references