CVE-2026-33689 xrdp: Pre-authentication out-of-bounds reads in channel parsers

What is CVE-2026-33689?

CVE-2026-33689 is a high-severity vulnerability in neutrinolabs xrdp, published on 17 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-125

Which versions are affected by CVE-2026-33689?

It affects 1 product.

Products include Neutrinolabs Xrdp.

How do I fix CVE-2026-33689?

Upgrade to a fixed version.

Is CVE-2026-33689 being exploited?

There is no known exploitation of CVE-2026-33689 in the wild and no public exploit code.

Other vulnerabilities in neutrinolabs xrdp

• CVE-2026-41252 xrdp: lib_palette_update Heap Buffer Overflow & RCE Critical 9.8
• CVE-2026-32105 xrdp: RDP MAC signature (dataSignature) never verified on receive — integrity bypass in non-TLS mode Critical 9.3
• CVE-2026-44178 xrdp: Channel Data Forwarding Fixed-Size Buffer Overflow High 8.8
• CVE-2026-32107 xrdp: Fail-open privilege drop in sesexec — child processes may execute as root if setuid fails High 8.8
• CVE-2026-35512 xrdp: Heap buffer overflow in EGFX channel High 8.7

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-33689, GHSA-92mr-6wpp-27jj, UBUNTU-CVE-2026-33689.