---
id: CVE-2026-121396
title: FreeRDP 3.0.0 before 3.32.2 denial of service via RTS padding assertion
summary: >-
  FreeRDP clients from 3.0.0 before 3.32.2 built with verbose WinPR assertions
  contain a reachable assertion in rts_read_auth_verifier triggered by malformed
  RTS padding. Attackers controlling an RD Gateway can send a crafted
  RPC-over-HTTP…
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 >= 3.0.0 < 3.32.2
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-03T17:52:02.362664Z'
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T18:31:13.343Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121396'
references:
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6p3w-fv52-cf24'
    label: GitHub Security Advisory (GHSA-6p3w-fv52-cf24)
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-3.0.0-before-3.32.2-denial-of-service-via-rts-padding-assertion
    label: >-
      VulnCheck Advisory: FreeRDP 3.0.0 before 3.32.2 denial of service via RTS
      padding assertion
tags:
  - cve.org
epss: 0.00317
epssPercentile: 0.24735
ingestedAt: '2026-11-05T20:33:06.361Z'
---

## Overview

FreeRDP clients from 3.0.0 before 3.32.2 built with verbose WinPR assertions contain a reachable assertion in rts_read_auth_verifier triggered by malformed RTS padding. Attackers controlling an RD Gateway can send a crafted RPC-over-HTTP RTS PDU with inconsistent authentication padding to abort the connecting client process.

## Affected

- `FreeRDP >= 3.0.0 < 3.32.2`

## Remediation

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