CVE-2026-54778 is a medium-severity race condition vulnerability in CoreWCF.UnixDomainSocket (nuget), affecting versions < 1.8.1. It is fixed in 1.8.1, 1.9.1.
Impact Race condition in POSIX peer identity resolution may attribute one connection’s identity to another (getpwuid/getgrgid non-reentrant) and may crash the host process under contention. Patches Fixed in CoreWCF v1.8.1 and v1.9.1 Workarounds Restrict UDS filesystem permissions so that only trusted local users can connect to the socket path. The race still exists but the attacker pool is constrained.
Multiple concurrent operations access a shared resource without proper synchronization, producing unpredictable results depending on timing. Typical impact: TOCTOU exploits, data corruption, or privilege escalation.
CVE-2026-54778 has a CVSS score of 6.2 (Medium). The vector is requires local access, no 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.UnixDomainSocket (< 1.8.1)CoreWCF.UnixDomainSocket (>= 1.9.0, < 1.9.1)CoreWCF.UnixDomainSocket → 1.8.1 (nuget)CoreWCF.UnixDomainSocket → 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-2026-54778 is reachable in your applications. Explore open-source security for your team.
See if CVE-2026-54778 is reachable in your applications. Get a demo
Upgrade the following packages to resolve this vulnerability:
CoreWCF.UnixDomainSocket to 1.8.1 or laterCoreWCF.UnixDomainSocket to 1.9.1 or laterKodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2026-54778 is a medium-severity race condition vulnerability in CoreWCF.UnixDomainSocket (nuget), affecting versions < 1.8.1. It is fixed in 1.8.1, 1.9.1. Multiple concurrent operations access a shared resource without proper synchronization, producing unpredictable results depending on timing.
CVE-2026-54778 has a CVSS score of 6.2 (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.UnixDomainSocket (nuget) versions < 1.8.1 is affected.
Yes. CVE-2026-54778 is fixed in 1.8.1, 1.9.1. Upgrade to this version or later.
Whether CVE-2026-54778 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.UnixDomainSocket to 1.8.1 or laterCoreWCF.UnixDomainSocket to 1.9.1 or later