---
id: CVE-2026-121962
title: FreeRDP before 3.32.2 Heap Buffer Overflow via Early User Authorization Read
summary: >-
  FreeRDP before 3.32.2 contains a heap buffer overflow in
  transport_default_read_pdu when handling partial Early User Authorization
  reads during PROTOCOL_HYBRID_EX CredSSP. A malicious RDP server can split the
  four-byte EUA result into sh…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: FreeRDP
product: FreeRDP
affected:
  - FreeRDP < 3.32.2
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-04T18:23:55.202290Z'
exploitAvailable: true
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T18:24:32.080Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121962'
references:
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-j536-qc58-pmf8'
    label: GitHub Security Advisory (GHSA-j536-qc58-pmf8)
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-before-3.32.2-heap-buffer-overflow-via-early-user-authorization-read
    label: >-
      VulnCheck Advisory: FreeRDP before 3.32.2 Heap Buffer Overflow via Early
      User Authorization Read
tags:
  - cve.org
  - exploit-available
ingestedAt: '2026-11-05T21:36:00.487Z'
---

## Overview

FreeRDP before 3.32.2 contains a heap buffer overflow in transport_default_read_pdu when handling partial Early User Authorization reads during PROTOCOL_HYBRID_EX CredSSP. A malicious RDP server can split the four-byte EUA result into short reads that advance the stream pointer beyond the 16 KiB allocation, causing an out-of-bounds write and client denial of service.

## Affected

- `FreeRDP < 3.32.2`

## Remediation

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