---
id: "CVE-2026-121398"
kind: "vulnerability"
aliases: ["CVE-2026-121398"]
title: "FreeRDP proxy: use-after-free during teardown lets a malicious target crash it"
severity: "high"
cvss: 8.2
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["freerdp", "freerdp-proxy", "rdp", "runtime", "self-hosted"]
not_affected_if: ["no-freerdp-proxy", "trusted-targets-only"]
published_at: "2026-11-03T15:17:27+00:00"
first_seen_at: "2026-11-03T15:21:57+00:00"
updated_at: "2026-11-03T15:22:47+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121398", "first_seen_at": "2026-11-03T15:21:57+00:00"}]
---

# FreeRDP proxy: use-after-free during teardown lets a malicious target crash it

FreeRDP before 3.32.2 has a cross-thread use-after-free in the freerdp-proxy dyn-channel-dump module during session teardown. A malicious RDP target can send dynamic channel data while the front client disconnects, making the proxy process read freed memory and crash.

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

## How to check

- Check the installed FreeRDP version with `xfreerdp --version` or your package manager.
- Look for freerdp-proxy and whether the dyn-channel-dump module is enabled in its configuration.

## Fix

- FreeRDP: move to `3.32.2` or later.

## Timeline

- 2026-11-03T15:21:57+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121398

## Documents

- [advisory] Vendor advisory: github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v3q2-qjvf-7rqw
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-dyn-channel-dump-module

## From the sources

FreeRDP before 3.32.2 contains a cross-thread use-after-free vulnerability in the freerdp-proxy dyn-channel-dump module during session teardown. A malicious RDP target can send dynamic channel data while the front client disconnects, letting the client thread read freed ChannelData 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_