---
id: CVE-2026-67305
title: >-
  FreeRDP Windows client before 3.29.0 contains a heap buffer overflow
  vulnerability in the clipboard virtual channel when processing
  CLIPRDR_FILE_CONTENTS_RESPONSE PDUs without validating the server-provided
  size against the destination b…
summary: >-
  FreeRDP Windows client before 3.29.0 contains a heap buffer overflow
  vulnerability in the clipboard virtual channel when processing
  CLIPRDR_FILE_CONTENTS_RESPONSE PDUs without validating the server-provided
  size against the destination b…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
vendor: freerdp
product: freerdp
affected:
  - freerdp < 3.29.0
patched:
  - freerdp 3.29.0
published: '2026-08-01'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T14:04:42.583'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67305'
references:
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cj9v-h4hq-29jr'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-windows-client-before-heap-buffer-overflow-via-cliprdr
    label: disclosure@vulncheck.com
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cj9v-h4hq-29jr'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00768
epssPercentile: 0.53576
ingestedAt: '2026-08-02T07:18:01.532Z'
---

## Overview

FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual channel when processing CLIPRDR_FILE_CONTENTS_RESPONSE PDUs without validating the server-provided size against the destination buffer. A malicious RDP server can send a response with a data payload significantly larger than requested, causing arbitrary heap memory corruption that may enable remote code execution when a user performs a paste operation.

## Affected

- `freerdp < 3.29.0`

## Remediation

Upgrade past the affected range:

- `freerdp 3.29.0`