---
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
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-19T21:28:49.859103Z'
exploitAvailable: true
published: '2026-10-17'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T21:29:11.944Z'
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
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-111881.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-111881'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2554616'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-111881'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-111881'
tags:
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
epss: 0.00245
epssPercentile: 0.15695
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.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-111881.json)