---
id: CVE-2026-109256
title: >-
  FreeRDP 3.10.0 through 3.32.2 contains a heap buffer overflow in the WinPR
  png_write_data callback that writes past the buffer after a realloc failure
summary: >-
  FreeRDP 3.10.0 through 3.32.2 contains a heap buffer overflow in the WinPR
  png_write_data callback that writes past the buffer after a realloc failure. A
  malicious RDP clipboard peer can supply a large CF_DIB image that triggers
  out-of-b…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-122
  - CWE-787
vendor: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
published: '2026-10-12'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T20:11:45.520'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109256'
references:
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-wf3x-658c-52m5'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-3.10.0-through-3.32.2-heap-buffer-overflow-in-winpr-png-conversion
    label: disclosure@vulncheck.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109256.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-109256'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2549835'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-109256'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109256'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - exploit-available
epss: 0.00307
epssPercentile: 0.23395
ingestedAt: '2026-10-12T18:00:08.178Z'
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-18T11:37:58.517960Z'
---

## Overview

FreeRDP 3.10.0 through 3.32.2 contains a heap buffer overflow in the WinPR png_write_data callback that writes past the buffer after a realloc failure. A malicious RDP clipboard peer can supply a large CF_DIB image that triggers out-of-bounds memcpy during PNG conversion, causing a client crash.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-13 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109256.json)