Out-of-bounds read in xrdp - CVE-2026-33689
Published: April 17, 2026
Vulnerability identifier: #VU126459
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-2026-33689
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 dynamic channel parser when processing a specially crafted sequence of packets during the initial connection phase. A remote attacker can send a specially crafted sequence of packets to disclose sensitive information or cause a denial of service.
The issue is reachable before authentication during RDP message parsing.
How to mitigate CVE-2026-33689
Install security update from vendor's website.