# CVE-2026-33689: xrdp: xrdp is an open source RDP server

CVE-2026-33689 is fixed in xrdp on 1 platform, first by DEBIAN-CVE-2026-33689, released April 17, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-33689
- Priority: Urgent
- CVSS: 9.1 (critical)
- EPSS: 0.0048
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 17, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xrdp Debian 12.15 (bookworm) | 0.9.21.1-1+deb12u3 | [DEBIAN-CVE-2026-33689](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33689.md) | Apr 17, 2026 |
| Linux | xrdp Debian 13.5 (trixie) | 0.10.1-3.1+deb13u2 | [DEBIAN-CVE-2026-33689](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33689.md) | Apr 17, 2026 |
| Linux | xrdp Debian 14 | 0.10.6-1 | [DEBIAN-CVE-2026-33689](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33689.md) | Apr 17, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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