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CVE-2026-54777— CoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance

Quick assessment

Affected
CoreWCF CoreWCF
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CoreWCF是CoreWCF团队开源的一个开源项目,旨在为 .NET Core 和 .NET 5+ 提供 WCF(Windows Communication Foundation)的替代实现。 CoreWCF 1.8.1之前版本和1.9.1之前版本存在安全漏洞，该漏洞源于NetNamedPipe传输机制在启动时存在竞争条件问题，允许攻击者本地拦截NetNamedPipe流量。

CVSS 6.5 · Medium EPSS 0.12% · P2

Affected Version Matrix 2

VendorProduct Version RangeStatus
CoreWCF CoreWCF >= 1.9.0, < 1.9.1 affected
< 1.8.1 affected
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I. Basic Information for CVE-2026-54777

Vulnerability Information
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Vulnerability Title
CoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance
Source: CVE Program / CVE List V5
Vulnerability 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, CoreWCF NetNamedPipe transport accepts attachment to a pre-existing named pipe instance, allowing local interception of NetNamedPipe traffic when an attacker races NamedPipeListener startup between shared memory GUID publication and service named pipe creation. This issue is fixed in versions 1.8.1 and 1.9.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
CoreWCF 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CoreWCF是CoreWCF团队开源的一个开源项目,旨在为 .NET Core 和 .NET 5+ 提供 WCF(Windows Communication Foundation)的替代实现。 CoreWCF 1.8.1之前版本和1.9.1之前版本存在安全漏洞，该漏洞源于NetNamedPipe传输机制在启动时存在竞争条件问题，允许攻击者本地拦截NetNamedPipe流量。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
CoreWCF CoreWCF >= 1.9.0, < 1.9.1 -

II. Public POCs for CVE-2026-54777

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III. Intelligence Information for CVE-2026-54777

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Patches & Fixes for CVE-2026-54777 (2)

Vendor Advisories for CVE-2026-54777 (1)

Vendor Pages for CVE-2026-54777 (1)

Other References for CVE-2026-54777 (1)

Same Patch Batch · CoreWCF · 2026-07-08 · 13 CVEs total

CVE-2026-54782 10.0 CRITICAL CoreWCF: Authentication bypass in CoreWCF SAML 1.1 / 2.0 token signature validation
CVE-2026-54772 7.5 HIGH CoreWCF: Pre-authentication infinite-loop CPU exhaustion in CoreWCF net.tcp / net.pipe / n
CVE-2026-54783 7.4 HIGH CoreWCF: XML Signature Wrapping in WS-Security endorsing/supporting signature verification
CVE-2026-54774 7.4 HIGH CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not a
CVE-2026-54781 7.4 HIGH CoreWCF: SAML SubjectConfirmation methods and holder-of-key proof keys are not enforced
CVE-2026-54784 7.4 HIGH CoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality
CVE-2026-54775 6.5 MEDIUM CoreWCF: Kafka consume pump halts permanently on a Kafka tombstone (null-value record), ca
CVE-2026-54778 6.2 MEDIUM CoreWCF: UnixDomainSocket Non-Reentrant POSIX Identity Resolution
CVE-2026-54779 5.9 MEDIUM CoreWCF: SAML token replay protection is inoperative
CVE-2026-54773 5.9 MEDIUM CoreWCF: WS-Security signature substitution via document-wide Signature lookup
CVE-2026-54776 4.4 MEDIUM CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the secu
CVE-2026-54780 3.7 LOW CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass

IV. Related Vulnerabilities

Same product: CoreWCF
Same vendor: CoreWCF
Same weakness: CWE-367

V. Comments for CVE-2026-54777

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