CVE-2026-67294

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{"bugzilla": {"description": "FreeRDP: FreeRDP: Server certificate validation bypass via improper Extended Key Usage (EKU) validation", "id": "2509999", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509999"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-295", "details": ["FreeRDP before 3.29.0 improperly validates the Extended Key Usage (EKU) purpose of the peer certificate during client-side server TLS authentication. In x509_utils_verify(), when server-purpose (X509_PURPOSE_SSL_SERVER) verification fails, the code falls back to client-purpose and any-purpose verification, so a trusted, hostname-matching certificate valid only for clientAuth can be accepted as the RDP server certificate. In environments relying on EKU separation between client and server certificates, this allows a clientAuth-only certificate issued by a trusted CA to bypass server certificate purpose validation.", "A flaw was found in FreeRDP. During client-side server Transport Layer Security (TLS) authentication, FreeRDP improperly validates the Extended Key Usage (EKU) purpose of the peer certificate. This vulnerability allows a certificate intended only for client authentication to be accepted as a server certificate, bypassing critical server certificate purpose validation. This could lead to an attacker presenting a clientAuth-only certificate from a trusted Certificate Authority (CA) to impersonate a legitimate server."], "name": "CVE-2026-67294", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-01T12:22:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-67294\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-67294\nhttps://github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319f\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-89c6-jjrw-96h4\nhttps://www.vulncheck.com/advisories/freerdp-before-tls-certificate-eku-bypass"], "threat_severity": "Low"}

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