CVE-2026-33516 HIGH

CVE-2026-33516: xrdp: Pre-authentication out-of-bounds reads in RDP capability and channel parsers

Vendor Neutrinolabs
Product xrdp
Weakness CWE-125
Published April 17, 2026
Last update April 20, 2026

CVSS base score

7.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

xrdp is an open source RDP server. Versions through 0.10.5 contain an out-of-bounds read vulnerability during the RDP capability exchange phase. The issue occurs when memory is accessed before validating the remaining buffer length. A remote, unauthenticated attacker can trigger this vulnerability by sending a specially crafted Confirm Active PDU. Successful exploitation could lead to a denial of service (process crash) or potential disclosure of sensitive information from the process memory. This issue has been fixed in version 0.10.6.

Key dates

02Disclosure timeline

April 17, 2026 CVE published
April 20, 2026 Record updated