What is GHSA-q6v9-43v5-jv9q?

GHSA-q6v9-43v5-jv9q is a security advisory published by GitHub Security Advisories with Medium severity. CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution

Which CVE IDs does GHSA-q6v9-43v5-jv9q cover?

GHSA-q6v9-43v5-jv9q covers the following CVE IDs: CVE-2026-54778. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-q6v9-43v5-jv9q?

GHSA-q6v9-43v5-jv9q has a CVSS v3 base score of 6.2, published by GitHub Security Advisories.

Which products are affected by GHSA-q6v9-43v5-jv9q?

GHSA-q6v9-43v5-jv9q affects 2 products, including: nuget/CoreWCF.UnixDomainSocket:\u003c 1.8.1; nuget/CoreWCF.UnixDomainSocket:\u003e= 1.9.0, \u003c 1.9.1.

GHSA-q6v9-43v5-jv9qMediumCVSS 6.2

CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution

Vendor

GitHub Security Advisories

Published

June 19, 2026

Last Modified

June 19, 2026

🔗 CVE IDs covered (1)

CVE-2026-54778 →

📋 Description

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 products2

nuget/CoreWCF.UnixDomainSocket:< 1.8.1
nuget/CoreWCF.UnixDomainSocket:>= 1.9.0, < 1.9.1

🔗 References (2)

https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-q6v9-43v5-jv9q
https://github.com/advisories/GHSA-q6v9-43v5-jv9q