NULL pointer dereference in FreeRDP - #VU146585
Published: September 1, 2026
Vulnerability identifier: #VU146585
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-476
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 a null pointer dereference in gdi_surface_bits when processing a surface bits command that claims to use NSCodec. A remote attacker can send a specially crafted RDP server message to cause a denial of service.
User interaction is required to connect to a malicious server, and the issue occurs when the client has not enabled NSCodec.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.31.0