---
id: "CVE-2026-121409"
kind: "vulnerability"
aliases: ["CVE-2026-121409"]
title: "FreeRDP: oversized routing token crashes RDP clients and proxies"
severity: "high"
cvss: 8.2
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["freerdp", "linux", "proxy", "rdp", "runtime", "windows"]
not_affected_if: ["freerdp-3.32.2-or-later", "trusted-servers-only"]
published_at: "2026-11-03T15:17:29+00:00"
first_seen_at: "2026-11-03T15:21:58+00:00"
updated_at: "2026-11-03T15:22:46+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121409", "first_seen_at": "2026-11-03T15:21:58+00:00"}]
---

# FreeRDP: oversized routing token crashes RDP clients and proxies

FreeRDP before 3.32.2 crashes when a malicious server or unauthenticated peer sends an oversized X.224 routing token in a Server Redirection PDU or to a FixedTarget freerdp-proxy. The crash stops the client or proxy process, which is a denial of service with no code execution stated in the sources.

_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`, and compare it to `3.32.2`.
- If you run freerdp-proxy with a FixedTarget configuration, note that this path is named in the advisory.

## Fix

- Move FreeRDP to `3.32.2` or later.

## Timeline

- 2026-11-03T15:21:58+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121409

## Documents

- [advisory] Vendor advisory: github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3hf9-w6hr-hf9j
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/freerdp-before-3.32.2-denial-of-service-via-oversized-x-224-routing-token

## From the sources

FreeRDP before 3.32.2 contains a denial of service vulnerability that allows malicious servers or unauthenticated peers to abort clients or proxies via oversized X.224 routing tokens. Attackers can send an oversized LoadBalanceInfo in a Server Redirection PDU, or a 240–247 byte token to a FixedTarget freerdp-proxy, triggering a tpdu_write_header assertion that crashes the 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_