---
id: CVE-2026-67299
title: >-
  FreeRDP before 3.29.0 contains a client-side heap use-after-free in the async
  update message proxy for WINDOW_ICON_ORDER when AsyncUpdate is enabled (e.g
summary: >-
  FreeRDP before 3.29.0 contains a client-side heap use-after-free in the async
  update message proxy for WINDOW_ICON_ORDER when AsyncUpdate is enabled (e.g.
  xfreerdp /async-update). In update_message_WindowIcon() a shallow CopyMemory()
  ove…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-416
vendor: freerdp
product: freerdp
affected:
  - freerdp < 3.29.0
patched:
  - freerdp 3.29.0
published: '2026-08-01'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T14:32:44.740'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67299'
references:
  - url: >-
      https://github.com/FreeRDP/FreeRDP/commit/5370fb26fbf034ecd11d3026b6ad639b5fff493f
    label: disclosure@vulncheck.com
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-34hq-hwjw-q8v3'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-before-use-after-free-via-windowicon-async-message
    label: disclosure@vulncheck.com
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-34hq-hwjw-q8v3'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00344
epssPercentile: 0.28002
ingestedAt: '2026-08-02T05:17:49.690Z'
---

## Overview

FreeRDP before 3.29.0 contains a client-side heap use-after-free in the async update message proxy for WINDOW_ICON_ORDER when AsyncUpdate is enabled (e.g. xfreerdp /async-update). In update_message_WindowIcon() a shallow CopyMemory() overwrites a freshly allocated lParam->iconInfo with the parser-owned windowIcon->iconInfo pointer. After the parser callback returns, update_recv_window_info_order() frees window_icon.iconInfo, but the queued async message still retains and later dispatches that stale pointer. A malicious or compromised RDP server sending a crafted RAIL Window Alternate Secondary Order with WINDOW_ORDER_ICON can trigger use-after-free, leading to memory corruption and client crash.

## Affected

- `freerdp < 3.29.0`

## Remediation

Upgrade past the affected range:

- `freerdp 3.29.0`