Vulnerability in Corewcf

CVE-2026-54778

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 concur…

Vulnerability class: Race Condition

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H.

Affected products

  • Corewcf — versions >= 1.9.0, < 1.9.1, < 1.8.1

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-54778?
CVE-2026-54778 is a medium-severity vulnerability in Corewcf, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.2/10. Published 2026-07-08.
How severe is CVE-2026-54778?
Medium severity. CVSS v3 base score is 6.2 out of 10.