Vulnerability · Published Apr 17, 2026 · Assigned by GitHub_M
CVE-2026-33689xrdp: Pre-authentication out-of-bounds reads in channel parsers
High 8.7
In plain English
A high-severity out-of-bounds read in xrdp from neutrinolabs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | xrdp | 0.10.6-r0 | ALPINE-CVE-2026-33689 |
| Alpine:v3.24 | xrdp | 0.10.6-r0 | ALPINE-CVE-2026-33689 |
| Debian:12 | xrdp | 0.9.21.1-1+deb12u3 | DEBIAN-CVE-2026-33689 |
| Debian:13 | xrdp | 0.10.1-3.1+deb13u2 | DEBIAN-CVE-2026-33689 |
| Debian:14 | xrdp | 0.10.6-1 | DEBIAN-CVE-2026-33689 |
| Ubuntu:22.04:LTS | xrdp | no fix listed | UBUNTU-CVE-2026-33689 |
| Ubuntu:24.04:LTS | xrdp | no fix listed | UBUNTU-CVE-2026-33689 |
| Ubuntu:25.10 | xrdp | no fix listed | UBUNTU-CVE-2026-33689 |
| Ubuntu:26.04:LTS | xrdp | no fix listed | UBUNTU-CVE-2026-33689 |
| Ubuntu:26.10 | xrdp | no fix listed | UBUNTU-CVE-2026-33689 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| neutrinolabs | xrdp | < 0.10.6 |
Weakness: CWE-125 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-92mr-6wpp-27jj x_refsource_CONFIRM
- https://github.com/neutrinolabs/xrdp/releases/tag/v0.10.6 x_refsource_MISC