CVE-2026-54777 is a medium-severity security vulnerability in CoreWCF.NetNamedPipe (nuget), affecting versions < 1.8.1. It is fixed in 1.8.1, 1.9.1.
Impact CoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance, allowing local interception of NetNamedPipe traffic. NetNamedPipe creates a shared memory object based on the listening url, then generated a unique GUID for the named pipe it will be using and saves this to the shared memory object. Then it creates the named pipe to listen for clients. This requires an attacker to race the service and create the named pipe between the service publishing the GUID to the shared memory location (which the attacker needs to read) and the service creating the named pipe itself. Patches Fixed in CoreWCF v1.8.1 and v1.9.1 Workarounds None
CVE-2026-54777 has a CVSS score of 6.5 (Medium). The vector is requires local access, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (1.8.1, 1.9.1). Upgrading removes the vulnerable code path.
nuget
CoreWCF.NetNamedPipe (< 1.8.1)CoreWCF.NetNamedPipe (>= 1.9.0, < 1.9.1)CoreWCF.NetNamedPipe → 1.8.1 (nuget)CoreWCF.NetNamedPipe → 1.9.1 (nuget)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
Kodem's runtime-powered SCA identifies whether CVE-2026-54777 is reachable in your applications. Explore open-source security for your team.
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Upgrade the following packages to resolve this vulnerability:
CoreWCF.NetNamedPipe to 1.8.1 or laterCoreWCF.NetNamedPipe to 1.9.1 or laterKodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2026-54777 is a medium-severity security vulnerability in CoreWCF.NetNamedPipe (nuget), affecting versions < 1.8.1. It is fixed in 1.8.1, 1.9.1.
CVE-2026-54777 has a CVSS score of 6.5 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
CoreWCF.NetNamedPipe (nuget) versions < 1.8.1 is affected.
Yes. CVE-2026-54777 is fixed in 1.8.1, 1.9.1. Upgrade to this version or later.
Whether CVE-2026-54777 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
CoreWCF.NetNamedPipe to 1.8.1 or laterCoreWCF.NetNamedPipe to 1.9.1 or later