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CVE-2026-54778 — Vulnerability in CoreWCF.UnixDomainSocket — CVE...

MEDIUM

CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution

Published June 19, 2026Updated June 19, 2026Source: osv

Summary

### 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.

Advisory Timeline

  • First published June 19, 2026 (115 days ago).
  • Last revised June 19, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update CoreWCF.UnixDomainSocket to 1.9.1 or later
dotnet add package CoreWCF.UnixDomainSocket --version 1.9.1
NuGet
Update CoreWCF.UnixDomainSocket to 1.8.1 or later
dotnet add package CoreWCF.UnixDomainSocket --version 1.8.1

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: nuget (1).

PackageEcosystemAffectedFixed In
CoreWCF.UnixDomainSocket
nuget
1.9.01.9.1
CoreWCF.UnixDomainSocket
nuget
1.5.0, 1.5.0-preview1, 1.5.1, 1.5.2 (+3 more)1.8.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 6.2 score means for each attack dimension.

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

References

Frequently Asked Questions

What is CVE-2026-54778?
CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 6.2/10).
How do I check if my project is affected by CVE-2026-54778?
CVE-2026-54778 affects CoreWCF.UnixDomainSocket. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-54778 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
6.2

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-q6v9-43v5-jv9q

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