CVE-2026-55238: CWE-126: Buffer Over-read in neutrinolabs xrdp
xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the processing of RDP Confirm Active PDU, where during the capability negotiation phase, the parser did not perform sufficient length validation for specific capability sets. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed capability data. Due to missing bounds checks, the xrdp process may perform out-of-bounds memory reads, which can result in the termination of the service (Denial of Service). However, since xrdp forks a new process for each connection by default, an out-of-bounds read causing a process crash is unlikely to bring down the entire xrdp service. This issue has been fixed in version 0.10.6.1.
AI Analysis
Technical Summary
The vulnerability in neutrinolabs xrdp (CVE-2026-55238) arises from insufficient length validation in the parser handling RDP Confirm Active PDUs during capability negotiation. Specifically, malformed capability data can trigger out-of-bounds memory reads (CWE-126), causing the affected xrdp process to crash. This denial of service condition affects versions up to and including 0.10.6. The design of xrdp, which forks a new process for each connection, mitigates the risk of a complete service outage. The vulnerability has been addressed in version 0.10.6.1.
Potential Impact
A remote, unauthenticated attacker can exploit this vulnerability by sending specially crafted RDP packets to cause out-of-bounds memory reads, resulting in the crash of the xrdp process handling that connection. This leads to a denial of service condition for that session. The overall xrdp service is unlikely to be fully disrupted due to its multi-process architecture. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade xrdp to version 0.10.6.1 or later, where this vulnerability is fixed. Since no official patch link or advisory is provided, verify the upgrade through the neutrinolabs official channels. No other mitigations are indicated.
CVE-2026-55238: CWE-126: Buffer Over-read in neutrinolabs xrdp
Description
xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the processing of RDP Confirm Active PDU, where during the capability negotiation phase, the parser did not perform sufficient length validation for specific capability sets. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed capability data. Due to missing bounds checks, the xrdp process may perform out-of-bounds memory reads, which can result in the termination of the service (Denial of Service). However, since xrdp forks a new process for each connection by default, an out-of-bounds read causing a process crash is unlikely to bring down the entire xrdp service. This issue has been fixed in version 0.10.6.1.
CVSS v3.1
Score 5.3medium
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
The vulnerability in neutrinolabs xrdp (CVE-2026-55238) arises from insufficient length validation in the parser handling RDP Confirm Active PDUs during capability negotiation. Specifically, malformed capability data can trigger out-of-bounds memory reads (CWE-126), causing the affected xrdp process to crash. This denial of service condition affects versions up to and including 0.10.6. The design of xrdp, which forks a new process for each connection, mitigates the risk of a complete service outage. The vulnerability has been addressed in version 0.10.6.1.
Potential Impact
A remote, unauthenticated attacker can exploit this vulnerability by sending specially crafted RDP packets to cause out-of-bounds memory reads, resulting in the crash of the xrdp process handling that connection. This leads to a denial of service condition for that session. The overall xrdp service is unlikely to be fully disrupted due to its multi-process architecture. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade xrdp to version 0.10.6.1 or later, where this vulnerability is fixed. Since no official patch link or advisory is provided, verify the upgrade through the neutrinolabs official channels. No other mitigations are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T16:44:00.624Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a5e56f42a4a8d5989689fa6
Added to database: 07/20/2026, 17:12:20 UTC
Last enriched: 07/20/2026, 17:27:37 UTC
Last updated: 07/21/2026, 03:47:42 UTC
Views: 12
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