---
id: CVE-2026-110839
title: >-
  FreeRDP 3.3.0 before 3.32.0, when built with WINPR_UTILS_IMAGE_JPEG=ON, has a
  heap-based out-of-bounds write in winpr_convert_from_jpeg because grayscale
  JPEG buffers are sized from one input component rather than three BGR output
  compon…
summary: >-
  FreeRDP 3.3.0 before 3.32.0, when built with WINPR_UTILS_IMAGE_JPEG=ON, has a
  heap-based out-of-bounds write in winpr_convert_from_jpeg because grayscale
  JPEG buffers are sized from one input component rather than three BGR output
  compon…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H'
cwe:
  - CWE-787
vendor: FreeRDP
product: FreeRDP
affected:
  - FreeRDP >= 3.3.0 < 3.32.0
published: '2026-10-14'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T16:17:47.300'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110839'
references:
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-99p4-8j24-wvj4'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-3.3.0-before-3.32.0-heap-out-of-bounds-write-via-grayscale-jpeg-clipboard-data
    label: disclosure@vulncheck.com
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-99p4-8j24-wvj4'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110839.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-110839'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2552996'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-110839'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110839'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-15T15:32:10.467016Z'
ingestedAt: '2026-10-15T00:02:07.174Z'
epss: 0.00272
epssPercentile: 0.19651
---

## Overview

FreeRDP 3.3.0 before 3.32.0, when built with WINPR_UTILS_IMAGE_JPEG=ON, has a heap-based out-of-bounds write in winpr_convert_from_jpeg because grayscale JPEG buffers are sized from one input component rather than three BGR output components. A malicious RDP server can offer a grayscale JPEG via clipboard redirection, corrupting client memory and crashing it when the item is pasted as CF_DIB bitmap data.

## 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 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110839.json)