Use-after-free in FreeRDP - CVE-2026-22851
Published: February 10, 2026
Vulnerability identifier: #VU122504
CSH Severity: Low
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-22851
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service attack.
The vulnerability exists due to a use-after-free error in SDL client (sdl->primary) caused by a race in RDPGFX ResetGraphics. A remote attacker can trick the victim into connecting to a malicious server and crash the application.
Note, the vulnerability affects SDL client only.
Affected software
FreeRDP
Ubuntu
freerdp3 (Ubuntu package)
Ubuntu
freerdp3 (Ubuntu package)
How to mitigate CVE-2026-22851
Install updates from vendor's website.
FreeRDP - update to 3.20.1
freerdp3 (Ubuntu package) - addressed in versions 3.5.1+dfsg1-0ubuntu1.4, 3.16.0+dfsg-2ubuntu0.3
freerdp3 (Ubuntu package) - addressed in versions 3.5.1+dfsg1-0ubuntu1.4, 3.16.0+dfsg-2ubuntu0.3