Out-of-bounds read in xrdp - CVE-2026-33516
Published: April 17, 2026
Vulnerability identifier: #VU126462
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-33516
CWE-ID: CWE-125
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 disclose sensitive information or cause a denial of service.
The vulnerability exists due to out-of-bounds read in the RDP capability exchange handling when processing a specially crafted Confirm Active PDU. A remote attacker can send a specially crafted Confirm Active PDU to disclose sensitive information or cause a denial of service.
The issue can be triggered during the pre-authentication phase.
How to mitigate CVE-2026-33516
Install security update from vendor's website.