Is CVE-2026-54778 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-54778?

CVE-2026-54778 has a CVSS v3 severity of MEDIUM (6.2).

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CVE-2026-54778

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 UnixDomainSocket POSIX peer identity resolution uses non-reentrant getpwuid and getgrgid calls, allowing concurrent connections to attribute one connection's identity to another or crash the host process under contention. This issue is fixed in versions 1.8.1 and 1.9.1.