# CVE-2026-54538: xrdp: xrdp is an open source RDP server

CVE-2026-54538 is fixed in 5 products on 1 platform, first by FEDORA-2026-952A486B39, released July 17, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-54538
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0067
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 17, 2026

## Description

xrdp is an open source RDP server. In versions 0.10.6 and prior, a n issue was discovered where the software fails to properly validate the totalLength field within the RDP protocol control header during packet reception. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted packet that forces the xrdp process or thread into an infinite, CPU-bound loop. Because the internal pointer fails to advance and the deadlock prevention mechanism is bypassed for specific protocol data unit types, the process consumes excessive CPU resources indefinitely. This can render the xrdp service unavailable and potentially lead to system-wide resource exhaustion if multiple malicious connections are established. This issue has been fixed in version 0.10.6.1.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xrdp Debian 12.15 (bookworm) | 0.9.21.1-1+deb12u3 | [DEBIAN-CVE-2026-54538](https://patchblox.com/security/data/fix/linux/debian-cve-2026-54538.md) | Aug 1, 2026 |
| Linux | xrdp Debian 13.5 (trixie) | 0.10.1-3.1+deb13u2 | [DEBIAN-CVE-2026-54538](https://patchblox.com/security/data/fix/linux/debian-cve-2026-54538.md) | Aug 1, 2026 |
| Linux | xrdp Debian 14 | 0.10.6.1-2 | [DEBIAN-CVE-2026-54538](https://patchblox.com/security/data/fix/linux/debian-cve-2026-54538.md) | Aug 1, 2026 |
| Linux | xrdp Fedora 43 | 1:0.10.6.1-3.fc43 | [FEDORA-2026-952A486B39](https://patchblox.com/security/data/fix/linux/fedora-2026-952a486b39.md) | Jul 17, 2026 |
| Linux | xrdp-debuginfo Fedora 43 | 1:0.10.6.1-3.fc43 | [FEDORA-2026-952A486B39](https://patchblox.com/security/data/fix/linux/fedora-2026-952a486b39.md) | Jul 17, 2026 |
| Linux | xrdp-debugsource Fedora 43 | 1:0.10.6.1-3.fc43 | [FEDORA-2026-952A486B39](https://patchblox.com/security/data/fix/linux/fedora-2026-952a486b39.md) | Jul 17, 2026 |
| Linux | xrdp-devel Fedora 43 | 1:0.10.6.1-3.fc43 | [FEDORA-2026-952A486B39](https://patchblox.com/security/data/fix/linux/fedora-2026-952a486b39.md) | Jul 17, 2026 |
| Linux | xrdp-selinux Fedora 43 | 1:0.10.6.1-3.fc43 | [FEDORA-2026-952A486B39](https://patchblox.com/security/data/fix/linux/fedora-2026-952a486b39.md) | Jul 17, 2026 |

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Data as of 2026-11-08T00:53:09Z 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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