FreeRDP Server before 3.31.0 Use-After-Free via DRDYNVC

{
  "id": "ebaeaabf70557d73041b65f2bacc730140366a25a49c7c6c0ac17aa68bc91231",
  "url": "https://osv.dev/vulnerability/CVE-2026-91947",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "FreeRDP Server before 3.31.0 Use-After-Free via DRDYNVC",
    "summary": "FreeRDP server versions before 3.31.0 contain a use-after-free vulnerability in the DRDYNVC parser that dereferences a channel pointer after releasing the synchronization lock. Authenticated clients can race AUDIN channel closure messages against DRDYNVC data parsing to trigger heap-use-after-free when accessing freed channel objects.",
    "evidence": "osv:CVE-2026-91947",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-91947",
      "aliases": [
        "CVE-2026-91947",
        "GHSA-6mpx-c8rj-whj5"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/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": "5ab2bed8749747b8e4b2ed431fd102bc726be684"
                },
                {
                  "fixed": "aa8650b300aa4cabd85d9c72b431301509b9043f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "fixed": "3.31.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.31.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "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"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91947.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.925193869Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91947.json",
        "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6mpx-c8rj-whj5",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-91947",
        "https://www.vulncheck.com/advisories/freerdp-server-before-3.31.0-use-after-free-via-drdynvc"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-362"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91947.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-91947",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519381,
  "published_at": "2026-09-15T15:18:05.774+00:00"
}