HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-67299 — FreeRDP before 3.29.0 contains a client-side heap use-after-free in the async up...

·Source: NIST NVD

Updated:

Executive 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() overwrites a freshly allocated lParam->iconInfo with the parser-owned windowIcon->iconInfo pointer. After the parser callback returns, update_recv_window_info_order()

Analysis

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. CVSS Score: 7.5. Published: 2026-08-01T13:16:59.250.

Indicators of Compromise (1)

CVE (1)
CVE-2026-67299
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Aug 1, 2026. Verified by: NIST.

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