Out-of-bounds write in FreeRDP - #VU146582
Published: September 1, 2026
Vulnerability identifier: #VU146582
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in urb_send_current_frame_number_result() in the urbdrc client channel when processing a crafted USB redirection message from an RDP server. A remote attacker can send a specially crafted 28-byte message to cause a denial of service.
User interaction is required to start an RDP connection with USB redirection enabled and a device actually redirected.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.31.0