FreeRDP before 3.29.0 TLS Certificate EKU Bypass

{
  "id": "9f730b8b8927683ce0faa1fb4b82112125e3d18bc5a3707a9a94f43e9e2f47ea",
  "url": "https://osv.dev/vulnerability/CVE-2026-67294",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "FreeRDP before 3.29.0 TLS Certificate EKU Bypass",
    "summary": "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.",
    "evidence": "osv:CVE-2026-67294",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-67294",
      "aliases": [
        "CVE-2026-67294",
        "GHSA-89c6-jjrw-96h4"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/freerdp/freerdp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "743f437f434c6814d3ba265c75cab14673bc2911"
                },
                {
                  "fixed": "f3b4347105114fe7453828736bea069999af319f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.29.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f3b4347105114fe7453828736bea069999af319f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.5.1",
            "3.5.0",
            "3.4.0",
            "3.3.0",
            "3.2.0",
            "3.1.0",
            "3.0.0",
            "3.0.0-rc0",
            "3.0.0-beta4",
            "3.0.0-beta3",
            "3.0.0-beta2",
            "3.0.0-beta1",
            "2.0.0",
            "2.0.0-rc4",
            "2.0.0-rc3",
            "2.0.0-rc2",
            "2.0.0-rc1",
            "2.0.0-rc0",
            "2.0.0-beta1+android11",
            "2.0.0-beta1+android10",
            "1.2.0-beta1+android9",
            "1.2.0-beta1+android7",
            "1.1.0-beta+2013071101",
            "1.1.0-beta1+ios4",
            "1.1.0-beta1+android5",
            "1.1.0-beta1+android4",
            "1.1.0-beta1+ios3",
            "1.1.0-beta1+ios2",
            "1.1.0-beta1+android3",
            "1.1.0-beta1+android2",
            "1.1.0-beta1+ios1",
            "1.1.0-beta1",
            "1.0.1",
            "1.0.0",
            "1.0-beta5",
            "1.0-beta4",
            "1.0-beta2",
            "1.0-beta1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67294.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.602876622Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67294.json",
        "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-89c6-jjrw-96h4",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-67294",
        "https://www.vulncheck.com/advisories/freerdp-before-tls-certificate-eku-bypass",
        "https://github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319f"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-295"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67294.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-67294",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497519,
  "published_at": "2026-08-01T12:22:17.731+00:00"
}