---
id: CVE-2026-109242
title: >-
  FreeRDP before 3.0.0 and 3.6.0 before 3.32.0 renders uninitialized heap memory
  from un-decoded progressive tiles because the tile->current buffer is
  allocated without zeroing
summary: >-
  FreeRDP before 3.0.0 and 3.6.0 before 3.32.0 renders uninitialized heap memory
  from un-decoded progressive tiles because the tile->current buffer is
  allocated without zeroing. A malicious RDP server can send a crafted
  WBT_TILE_FIRST then…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'
cwe:
  - CWE-908
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T17:17:15.023'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109242'
references:
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4mpr-hmqx-83q8'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-before-3.0.0-and-3.6.0-before-3.32.0-uninitialized-heap-disclosure-via-progressive-codec-tile-upgrade
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T18:00:08.173Z'
---

## Overview

FreeRDP before 3.0.0 and 3.6.0 before 3.32.0 renders uninitialized heap memory from un-decoded progressive tiles because the tile->current buffer is allocated without zeroing. A malicious RDP server can send a crafted WBT_TILE_FIRST then WBT_TILE_UPGRADE sequence to paint heap bytes onscreen or abort the client process.

## Remediation

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