{"id":"CVE-2026-91947","title":"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","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 message…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-362","CWE-825"],"vendor":"FreeRDP","product":"FreeRDP","affected":["FreeRDP >= 2.0.0 < 3.31.0"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T16:17:21.927","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91947","references":[{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6mpx-c8rj-whj5","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/freerdp-server-before-3.31.0-use-after-free-via-drdynvc","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91947.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-91947"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533942"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91947"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91947"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-16T03:56:30.482586Z"},"ingestedAt":"2026-09-15T15:39:12.922Z","epss":0.003,"epssPercentile":0.22918,"slug":"CVE-2026-91947","body":"## Overview\n\nFreeRDP 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91947.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}