CVE-2026-54776

{"id": "CVE-2026-54776", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54776", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-09T12:56:10.364263Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.4, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 1.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "CoreWCF", "product": "CoreWCF", "versions": [{"status": "affected", "version": ">= 1.9.0, < 1.9.1"}, {"status": "affected", "version": "< 1.8.1"}]}]}], "published": "2026-07-08T23:16:55.360", "references": [{"url": "https://github.com/CoreWCF/CoreWCF/commit/994431268e3362c0cd126450fe2a135c202551f3", "source": "security-advisories@github.com"}, {"url": "https://github.com/CoreWCF/CoreWCF/commit/9af16955e51a57348dafce0019e259a092ef7440", "source": "security-advisories@github.com"}, {"url": "https://github.com/CoreWCF/CoreWCF/commit/f2f1a05927a88b8a75fa0582fa8ed75eb891e463", "source": "security-advisories@github.com"}, {"url": "https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1", "source": "security-advisories@github.com"}, {"url": "https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1", "source": "security-advisories@github.com"}, {"url": "https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-wjpq-6766-7f5j", "source": "security-advisories@github.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-306"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-07-09T16:29:14.203", "sourceIdentifier": "security-advisories@github.com"}