CVE-2026-55639 Details
Description
xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create Request during the connection sequence. During the initial capability and security negotiation phase, the parser fails to perform sufficient length validation for the incoming data block. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed data. Due to missing bounds checks, the xrdp process may read a small number of bytes beyond the declared data block boundary, potentially disclosing process memory contents that could be combined with other vulnerabilities. This issue has been fixed in version 0.10.6.1.
A vulnerability exists in xrdp versions through 0.10.6, related to the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create Request. During the initial capability and security negotiation phase, the parser does not adequately validate the length of incoming data blocks. This flaw allows remote, unauthenticated attackers to send specially crafted RDP packets with malformed data. The absence of proper bounds checks may enable the xrdp process to read a few bytes beyond the declared data block boundary, potentially disclosing process memory contents that could be exploited in conjunction with other vulnerabilities.
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] | ProductRelease Notes |
| https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-6g36-mxcf-r3gc | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds 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 29, 2026 | Initial Analysis | [email protected] |
| Jul 20, 2026 | CVE Modified | CISA-ADP |
| Jul 20, 2026 | New CVE Received | [email protected] |