---
id: CVE-2026-111881
title: FreeRDP 3.14.1 before 3.32.0 Integer Underflow in BMP Writer via Clipboard
summary: >-
  FreeRDP from 3.14.1 before 3.32.0 contains an integer underflow in the WinPR
  BMP writer, where a mismatched stride calculation passes SIZE_MAX - 3 to
  Stream_Zero for sub-byte images. A malicious RDP clipboard peer can return a
  crafted 1-…
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H'
cvssSource: cna
cwe:
  - CWE-191
vendor: FreeRDP
product: FreeRDP
affected:
  - FreeRDP >= 3.14.1 < 3.32.0
published: '2026-10-17'
updated: '2026-10-17'
sourceUpdated: '2026-10-17T18:46:09.069Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111881'
references:
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-27m7-gwhh-6hhf'
    label: GitHub Security Advisory (GHSA-27m7-gwhh-6hhf)
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-3.14.1-before-3.32.0-integer-underflow-in-bmp-writer-via-clipboard
    label: >-
      VulnCheck Advisory: FreeRDP 3.14.1 before 3.32.0 Integer Underflow in BMP
      Writer via Clipboard
tags:
  - cve.org
ingestedAt: '2026-10-17T19:08:56.962Z'
---

## Overview

FreeRDP from 3.14.1 before 3.32.0 contains an integer underflow in the WinPR BMP writer, where a mismatched stride calculation passes SIZE_MAX - 3 to Stream_Zero for sub-byte images. A malicious RDP clipboard peer can return a crafted 1-bpp BMP processed by clipboard_synthesize_image_format_to_bmp for CF_DIB/CF_DIBV5, crashing the client or causing an out-of-bounds write.

## Affected

- `FreeRDP >= 3.14.1 < 3.32.0`

## Remediation

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