CVE-2026-54538: CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') in neutrinolabs xrdp
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.
AI Analysis
Technical Summary
CVE-2026-54538 is a vulnerability in the open source RDP server xrdp where the totalLength field in the RDP protocol control header is not properly validated during packet reception. An attacker can send a crafted packet that causes the xrdp process or thread to enter an infinite CPU-bound loop because the internal pointer does not advance and the deadlock prevention mechanism is bypassed for certain protocol data unit types. This results in high CPU usage and can render the xrdp service unavailable or exhaust system resources if multiple connections exploit the flaw. The vulnerability affects versions up to and including 0.10.6 and is fixed in version 0.10.6.1.
Potential Impact
The vulnerability allows unauthenticated remote attackers to cause a denial of service by forcing the xrdp service into an infinite loop, consuming excessive CPU resources. This can lead to service unavailability and potential system-wide resource exhaustion under multiple exploit attempts. There is no impact on confidentiality or integrity.
Mitigation Recommendations
Upgrade xrdp to version 0.10.6.1 or later, where this issue has been fixed. No other mitigations are specified. Patch status is confirmed fixed in 0.10.6.1.
CVE-2026-54538: CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') in neutrinolabs xrdp
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.
CVSS v3.1
Score 7.5high
Affected software
pkg:github/neutrinolabs/xrdpRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-54538 is a vulnerability in the open source RDP server xrdp where the totalLength field in the RDP protocol control header is not properly validated during packet reception. An attacker can send a crafted packet that causes the xrdp process or thread to enter an infinite CPU-bound loop because the internal pointer does not advance and the deadlock prevention mechanism is bypassed for certain protocol data unit types. This results in high CPU usage and can render the xrdp service unavailable or exhaust system resources if multiple connections exploit the flaw. The vulnerability affects versions up to and including 0.10.6 and is fixed in version 0.10.6.1.
Potential Impact
The vulnerability allows unauthenticated remote attackers to cause a denial of service by forcing the xrdp service into an infinite loop, consuming excessive CPU resources. This can lead to service unavailability and potential system-wide resource exhaustion under multiple exploit attempts. There is no impact on confidentiality or integrity.
Mitigation Recommendations
Upgrade xrdp to version 0.10.6.1 or later, where this issue has been fixed. No other mitigations are specified. Patch status is confirmed fixed in 0.10.6.1.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-15T18:40:01.652Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a5e56f42a4a8d5989689fa2
Added to database: 07/20/2026, 17:12:20 UTC
Last enriched: 07/20/2026, 17:26:46 UTC
Last updated: 07/21/2026, 07:53:01 UTC
Views: 12
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