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 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.
Vulnerability class: Race Condition
EPSS: 0.001 (1.0th percentile) — read the EPSS interpretation.
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
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
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.