CVE-2026-33516: xrdp: Pre-authentication out-of-bounds reads in RDP capability and channel parsers
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.
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2026-33516?
CVE-2026-33516 has been classified as a medium severity vulnerability due to its potential for exploitation during the RDP capability exchange.
How do I fix CVE-2026-33516?
To fix CVE-2026-33516, upgrade xrdp to version 0.10.6 or later.
What versions of xrdp are affected by CVE-2026-33516?
xrdp versions through 0.10.5 are affected by CVE-2026-33516.
What type of vulnerability is CVE-2026-33516?
CVE-2026-33516 is an out-of-bounds read vulnerability occurring during the RDP capability exchange phase.
What impact does CVE-2026-33516 have?
The impact of CVE-2026-33516 may include potential information disclosure due to improper memory access.