CVE-2026-55238 Details
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.
A denial-of-service vulnerability has been identified in xrdp, an open-source RDP server, in versions through 0.10.6. The issue arises during the capability negotiation phase, where the parser fails to adequately validate the length of certain capability sets in RDP Confirm Active PDUs. This lack of proper input validation allows remote, unauthenticated attackers to send specially crafted RDP packets with malformed capability data. The missing bounds checks can lead to out-of-bounds memory reads, causing the xrdp process to crash and terminate the service. However, because xrdp typically forks a new process for each connection, a process crash is unlikely to disrupt the entire xrdp service.
Users can upgrade to xrdp version 0.10.6.1 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 20, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/neutrinolabs/xrdp/releases/tag/v0.10.6.1 | [email protected] | Release Notes |
| https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-mg8j-x9rw-9xv3 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-126 | Buffer Over-read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| neutrinolabs xrdp | < 0.10.6.1 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | Initial Analysis | [email protected] |
| Jul 20, 2026 | CVE Modified | CISA-ADP |
| Jul 20, 2026 | New CVE Received | [email protected] |