{"id":"CVE-2026-91947","summary":"FreeRDP Server before 3.31.0 Use-After-Free via DRDYNVC","details":"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.","aliases":["GHSA-6mpx-c8rj-whj5"],"modified":"2026-09-18T03:30:44.793281550Z","published":"2026-09-15T15:18:05.774Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91947.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-362"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91947.json"},{"type":"ADVISORY","url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6mpx-c8rj-whj5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91947"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/freerdp-server-before-3.31.0-use-after-free-via-drdynvc"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/freerdp/freerdp","events":[{"introduced":"5ab2bed8749747b8e4b2ed431fd102bc726be684"},{"fixed":"aa8650b300aa4cabd85d9c72b431301509b9043f"}],"database_specific":{"extracted_events":[{"introduced":"2.0.0"},{"fixed":"3.31.0"},{"introduced":"0"}],"source":["AFFECTED_FIELD","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"}}],"schema_version":"1.9.0","severity":[{"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"}]}