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CVE-2026-54778mediumCWE-362CWE-825

CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.2epss 0.1%
exploitation probability
0.1%top 99% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Affected products
CoreWCF · CoreWCF
References
https://github.com/CoreWCF/CoreWCF/commit/a3d95ea4627b818995e92c7def4c016164cacfcehttps://github.com/CoreWCF/CoreWCF/commit/b0acb105589b455a095ea5ff49f5191e4eeff791https://github.com/CoreWCF/CoreWCF/commit/b4867547c94bb088568935d581a55dda18a621e1https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-q6v9-43v5-jv9q