CVE-2026-33689: xrdp: Pre-authentication out-of-bounds reads in channel parsers
xrdp is an open source RDP server. Versions through 0.10.5 have an out-of-bounds read vulnerability in the pre-authentication RDP message parsing logic. A remote, unauthenticated attacker can trigger this flaw by sending a specially crafted sequence of packets during the initial connection phase. This vulnerability results from insufficient validation of input buffer lengths before processing dynamic channel communication. Successful exploitation can lead to a denial-of-service (DoS) condition via a process crash or potential disclosure of sensitive information from the service's memory space. 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-2026-33689?
CVE-2026-33689 is classified as a medium severity vulnerability due to its potential for pre-authentication out-of-bounds reads.
How do I fix CVE-2026-33689?
To mitigate CVE-2026-33689, upgrade the xrdp software to version 0.10.6 or later.
Who is affected by CVE-2026-33689?
CVE-2026-33689 affects all versions of xrdp up to and including 0.10.5.
What are the risks associated with CVE-2026-33689?
CVE-2026-33689 allows remote, unauthenticated attackers to exploit out-of-bounds reads, potentially leading to information disclosure.
When was CVE-2026-33689 published?
CVE-2026-33689 was published in 2026, highlighting a critical vulnerability in the open source RDP server xrdp.