---
id: CVE-2026-121406
title: FreeRDP before 3.32.2 Client Denial of Service via Zero-Output ZGFX Payload
summary: >-
  FreeRDP before 3.32.2 allows a client assertion abort because
  rdpgfx_on_data_received rejects only negative zgfx_decompress status and
  passes the resulting null output pointer to Stream_StaticConstInit. A
  malicious RDP server can send a …
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'
cvssSource: cna
cwe:
  - CWE-617
vendor: FreeRDP
product: FreeRDP
affected:
  - FreeRDP < 3.32.2
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-07T02:52:17.471246Z'
exploitAvailable: true
published: '2026-11-03'
updated: '2026-11-07'
sourceUpdated: '2026-11-07T02:52:48.281Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121406'
references:
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2c9x-4gr7-hrwx'
    label: GitHub Security Advisory (GHSA-2c9x-4gr7-hrwx)
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-before-3.32.2-client-denial-of-service-via-zero-output-zgfx-payload
    label: >-
      VulnCheck Advisory: FreeRDP before 3.32.2 Client Denial of Service via
      Zero-Output ZGFX Payload
tags:
  - cve.org
  - exploit-available
epss: 0.00234
epssPercentile: 0.14421
ingestedAt: '2026-11-05T19:30:42.963Z'
---

## Overview

FreeRDP before 3.32.2 allows a client assertion abort because rdpgfx_on_data_received rejects only negative zgfx_decompress status and passes the resulting null output pointer to Stream_StaticConstInit. A malicious RDP server can send a zero-output ZGFX payload on the RDPGFX channel after session activation to terminate the client.

## Affected

- `FreeRDP < 3.32.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.