CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | CoreWCF.UnixDomainSocket | < 1.8.1, >= 1.9.0, < 1.9.1 | 1.8.1, 1.9.1 |
References
- CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H- Weakness (CWE)
CWE-362, CWE-825- Platform
- .NET (NuGet)
- Package
CoreWCF.UnixDomainSocket- Disclosed
- 19.06.2026
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-q6v9-43v5-jv9q - CC BY 4.0
Vulnerability history: CoreWCF.UnixDomainSocket
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 06.2026 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 2
Disclosures per year
- 2026: 2
-
CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution this entry
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