Use-after-free in FreeRDP - CVE-2026-121953
Published: November 10, 2026 / Updated: November 11, 2026
Vulnerability identifier: #VU164429
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-121953
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to crash the FreeRDP client and potentially execute arbitrary code.
The vulnerability exists due to use-after-free in the rdpgfx and rdpsnd dynamic virtual channel callbacks when duplicate channel names overwrite shared callback slots that remain dangling after closure. A remote attacker can operate a malicious RDP server, complete the handshake, create same-name channels with different identifiers, close the second, and trigger processing on the surviving channel to dereference freed memory, causing a denial of service or potentially redirecting execution through a controlled pointer.
Affected software
FreeRDP
How to mitigate CVE-2026-121953
Install security update from vendor's website.
FreeRDP - update to 3.32.2