---
id: "CVE-2026-121953"
kind: "vulnerability"
aliases: ["CVE-2026-121953"]
title: "FreeRDP: malicious RDP server can crash client or run code"
severity: "critical"
cvss: 9.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["freerdp", "package", "rdp", "remote-desktop"]
not_affected_if: ["no-untrusted-rdp-hosts", "server-only-use"]
published_at: "2026-11-04T16:17:47+00:00"
first_seen_at: "2026-11-04T16:28:11+00:00"
updated_at: "2026-11-04T16:28:38+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121953", "first_seen_at": "2026-11-04T16:28:11+00:00"}]
---

# FreeRDP: malicious RDP server can crash client or run code

FreeRDP's client has a use-after-free in its rdpgfx dynamic virtual channel: a duplicate-name channel overwrites a callback that is freed without being cleared. A malicious RDP server can trigger a crash of the client or potentially execute code on it.

_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 below.
- Find where FreeRDP is bundled in applications or packages on the machine that connect to remote desktops.

## Fix

- FreeRDP: move to `3.32.2` or later.

## Timeline

- 2026-11-04T16:28:11+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121953

## Documents

- [advisory] Vendor advisory: github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6wqx-rv3q-vcxp
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-rdpgfx-dynamic-virtual-channel-close

## From the sources

FreeRDP before 3.32.2 has a use-after-free in the client's rdpgfx dynamic virtual channel: a duplicate-name channel with a new ChannelId overwrites the listener's single callback slot, which rdpgfx_on_close frees without clearing. A malicious RDP server can open and close such a channel, then send a PDU on the original channel to crash the client or potentially execute code.

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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_