---
id: "CVE-2026-121963"
kind: "vulnerability"
aliases: ["CVE-2026-121963"]
title: "FreeRDP: malicious RDP server can crash client via audio channel"
severity: "high"
cvss: 8.2
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["freerdp", "linux", "package", "remote-desktop", "windows"]
not_affected_if: ["freerdp-3.32.2-or-later", "only-trusted-rdp-servers"]
published_at: "2026-11-04T16:17:49+00:00"
first_seen_at: "2026-11-04T16:28:14+00:00"
updated_at: "2026-11-04T16:28:46+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121963", "first_seen_at": "2026-11-04T16:28:14+00:00"}]
---

# FreeRDP: malicious RDP server can crash client via audio channel

FreeRDP before 3.32.2 has a use-after-free in its asynchronous rdpsnd audio channel. A malicious RDP server can close the channel with queued audio data so the client reads freed memory, which crashes the client.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed FreeRDP version (for example `xfreerdp --version`) and compare it with the fixed release.
- Look for FreeRDP builds bundled inside other applications, since those may not show up as a separate package.

## Fix

- FreeRDP: upgrade to `3.32.2` or later.

## Timeline

- 2026-11-04T16:28:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121963

## Documents

- [advisory] Vendor advisory: github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cx9c-q4jc-wm6c
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-dynamic-rdpsnd-channel-close

## From the sources

FreeRDP before 3.32.2 contains a use-after-free vulnerability in the asynchronous dynamic rdpsnd channel that allows malicious RDP servers to trigger freed callback access by closing the channel with queued audio PDUs. Attackers can send a training PDU then close the channel so the playback thread reads the freed callback in rdpsnd_virtual_channel_write, crashing the client.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_