---
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: '2026-09-24'
sourceUpdated: '2026-09-24T20:44:42.207'
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
epss: 0.00322
epssPercentile: 0.22557
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-16T03:56:30.482586Z'
ingestedAt: '2026-09-15T15:39:12.922Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **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)