---
id: "CVE-2026-121961"
kind: "vulnerability"
aliases: ["CVE-2026-121961"]
title: "FreeRDP proxy: use-after-free lets a malicious server crash the proxy"
severity: "high"
cvss: 8.2
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["freerdp", "rdp", "remote-desktop", "runtime"]
not_affected_if: ["no-freerdp-proxy", "version-3.32.2-or-later"]
published_at: "2026-11-04T16:17:49+00:00"
first_seen_at: "2026-11-04T16:28:14+00:00"
updated_at: "2026-11-04T16:28:47+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121961", "first_seen_at": "2026-11-04T16:28:14+00:00"}]
---

# FreeRDP proxy: use-after-free lets a malicious server crash the proxy

FreeRDP's freerdp-proxy frees a memory context it still uses when intercepting the drdynvc channel. A malicious target server can repeatedly send CREATE_REQUEST_PDU for an active channel id, causing the proxy process to crash.

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

## How to check

- Check the installed FreeRDP version, for example with `xfreerdp --version` or `freerdp-proxy --version` (unknown if the sources do not give the command).
- Look for whether `freerdp-proxy` is deployed in your environment, since the flaw is in the proxy component.

## Fix

- FreeRDP versions before `3.32.2` are affected; move to `3.32.2` or later.

## Timeline

- 2026-11-04T16:28:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121961

## Documents

- [advisory] Vendor advisory: github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qw7w-hhxq-763c
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-drdynvc-tracker-race

## From the sources

FreeRDP before 3.32.2 contains a use-after-free vulnerability in the freerdp-proxy DRDYNVC tracker when intercepting the drdynvc channel. A malicious target server can repeatedly send CREATE_REQUEST_PDU for an active channel id, racing front DATA handling to free a borrowed context and crash the proxy process.

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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_