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Vulnerability · Published Aug 1, 2026 · Assigned by VulnCheck

CVE-2026-67299FreeRDP before 3.29.0 Use-After-Free via WindowIcon async message

High 7.5

In plain English

A high-severity use-after-free in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 65.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10freerdp2:3.10.3-12.el10_2.8ALSA-2026:54486
AlmaLinux:8freerdp2:2.11.7-11.el8_10ALSA-2026:54485
AlmaLinux:9freerdp2:2.11.7-7.el9_8.5ALSA-2026:54487
AlmaLinux:10freerdp-devel2:3.10.3-12.el10_2.8ALSA-2026:54486
AlmaLinux:8freerdp-devel2:2.11.7-11.el8_10ALSA-2026:54485
AlmaLinux:9freerdp-devel2:2.11.7-7.el9_8.5ALSA-2026:54487
AlmaLinux:10freerdp-libs2:3.10.3-12.el10_2.8ALSA-2026:54486
AlmaLinux:8freerdp-libs2:2.11.7-11.el8_10ALSA-2026:54485
AlmaLinux:9freerdp-libs2:2.11.7-7.el9_8.5ALSA-2026:54487
AlmaLinux:10freerdp-server2:3.10.3-12.el10_2.8ALSA-2026:54486
AlmaLinux:10libwinpr2:3.10.3-12.el10_2.8ALSA-2026:54486
AlmaLinux:8libwinpr2:2.11.7-11.el8_10ALSA-2026:54485
AlmaLinux:9libwinpr2:2.11.7-7.el9_8.5ALSA-2026:54487
AlmaLinux:10libwinpr-devel2:3.10.3-12.el10_2.8ALSA-2026:54486
AlmaLinux:8libwinpr-devel2:2.11.7-11.el8_10ALSA-2026:54485
AlmaLinux:9libwinpr-devel2:2.11.7-7.el9_8.5ALSA-2026:54487
Debian:12freerdp2no fix listedDEBIAN-CVE-2026-67299
Debian:13freerdp3no fix listedDEBIAN-CVE-2026-67299
Debian:14freerdp33.29.0+dfsg-1DEBIAN-CVE-2026-67299
Rocky Linux:10freerdp2:3.10.3-12.el10_2.8RLSA-2026:54486
Rocky Linux:8freerdp2:2.11.7-11.el8_10RLSA-2026:54485
Rocky Linux:9freerdp2:2.11.7-7.el9_8.5RLSA-2026:54487
Ubuntu:22.04:LTSfreerdp2no fix listedUBUNTU-CVE-2026-67299
Ubuntu:24.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.24.04.1UBUNTU-CVE-2026-67299
Ubuntu:26.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.26.04.1UBUNTU-CVE-2026-67299

Affected products (as reported)

VendorProductVersions
FreeRDP FreeRDP 0 – before 3.29.0

Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References