Heap-based buffer overflow in xrdp - CVE-2026-32623
Published: April 17, 2026
Vulnerability identifier: #VU126461
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-32623
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: neutrinolabs
Affected software:
xrdp
xrdp
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code or cause a denial of service.
The vulnerability exists due to heap-based buffer overflow in the NeutrinoRDP channel reassembly logic when processing reassembled fragmented virtual channel data while proxying RDP sessions to another server. A remote attacker can send specially crafted RDP channel data from a downstream server position to execute arbitrary code or cause a denial of service.
The issue only affects environments where the NeutrinoRDP module has been explicitly compiled and enabled, and exploitation requires a malicious downstream RDP server or a man-in-the-middle position.
How to mitigate CVE-2026-32623
Install security update from vendor's website.