CVE-2026-54776 Details
Description
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, a CoreWCF service hosted on Unix Domain Sockets with PosixIdentity client credentials can accept connections that skip the application/unixposix stream upgrade before dispatching messages, bypassing framing-layer identity checks in UnixPosixIdentitySecurityUpgradeProvider. This issue is fixed in versions 1.8.1 and 1.9.1.
A vulnerability exists in CoreWCF versions prior to 1.8.1 and 1.9.1, where a service hosted on Unix Domain Sockets with PosixIdentity client credentials can accept connections that bypass the required application/unixposix stream upgrade. This oversight allows messages to be dispatched without proper identity checks, potentially leading to unauthorized access or actions.
Users can upgrade to CoreWCF versions 1.8.1 or 1.9.1, both of which include the necessary fix. Additionally, as a temporary workaround, restrict filesystem access to the Unix Domain Socket file to ensure that only authorized POSIX users can connect to the service.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 8, 2026CISA-ADP
Assessed Jul 9, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/CoreWCF/CoreWCF/commit/994431268e3362c0cd126450fe2a135c202551f3 | [email protected] | Source CodeVendor |
| https://github.com/CoreWCF/CoreWCF/commit/9af16955e51a57348dafce0019e259a092ef7440 | [email protected] | Source CodeVendor |
| https://github.com/CoreWCF/CoreWCF/commit/f2f1a05927a88b8a75fa0582fa8ed75eb891e463 | [email protected] | Source CodeVendor |
| https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1 | [email protected] | Release NotesVendor |
| https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1 | [email protected] | Release NotesVendor |
| https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-wjpq-6766-7f5j | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| CoreWCF | 1.8.0 (semver) 1.9.0 (semver) |
CPE
Remediation
| |
| CoreWCF.ConfigurationManager | All versions |
CPE
Remediation
| |
| CoreWCF.Http | All versions |
CPE
Remediation
| |
| CoreWCF.Kafka | All versions |
CPE
Remediation
| |
| CoreWCF.Kafka.Client | All versions |
CPE
Remediation
| |
| CoreWCF.MSMQ | All versions |
CPE
Remediation
| |
| CoreWCF.NetFramingBase | All versions |
CPE
Remediation
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| CoreWCF.NetNamedPipe | All versions |
CPE
Remediation
| |
| CoreWCF.NetTcp | All versions |
CPE
Remediation
| |
| CoreWCF.Primitives | All versions |
CPE
Remediation
| |
| CoreWCF.Queue | All versions |
CPE
Remediation
| |
| CoreWCF.RabbitMQ | All versions |
CPE
Remediation
| |
| CoreWCF.RabbitMQ.Client | All versions |
CPE
Remediation
| |
| CoreWCF.Templates | All versions |
CPE
Remediation
| |
| CoreWCF.UnixDomainSocket | All versions |
CPE
Remediation
| |
| CoreWCF.WebHttp | All versions |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 9, 2026 | CVE Modified | CISA-ADP |
| Jul 8, 2026 | New CVE Received | [email protected] |