---
id: "CVE-2026-121390"
kind: "vulnerability"
aliases: ["CVE-2026-121390"]
title: "FreeRDP: malformed gateway response crashes the client via reachable assertion"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["freerdp", "package", "rdp-clients", "windows"]
not_affected_if: ["default-config", "fixed-version"]
published_at: "2026-11-03T15:17:26+00:00"
first_seen_at: "2026-11-03T15:21:57+00:00"
updated_at: "2026-11-03T15:24:43+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121390", "first_seen_at": "2026-11-03T15:21:57+00:00"}]
---

# FreeRDP: malformed gateway response crashes the client via reachable assertion

FreeRDP 3.0.0 before 3.32.2, built with WITH_AAD=ON, accepts an ARM gateway response that lacks a string redirectedServerCert field and passes a null buffer to the certificate parser. A malicious or malformed gateway selected by the user can make the client process abort.

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

## How to check

- Check the FreeRDP version with `xfreerdp --version` or the packaged version of freerdp.
- Check whether the build enabled WITH_AAD (look for it in the build configuration or CMake cache).

## Fix

- FreeRDP 3.x: move to `3.32.2` or later.

## Timeline

- 2026-11-03T15:21:57+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121390

## Documents

- [advisory] Vendor advisory: github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hqf8-95c7-6r92
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/freerdp-before-3.32.2-null-pointer-crash-via-arm-gateway-response

## From the sources

FreeRDP 3.0.0 before 3.32.2 built with WITH_AAD=ON contains a reachable assertion because its ARM gateway response parser accepts a missing or non-string redirectedServerCert field and passes a null buffer to the certificate parser. A malicious or malformed user-selected gateway can return such a response to abort the client 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_