CVE-2026-55639: CWE-125: Out-of-bounds Read in neutrinolabs xrdp
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.
AI Analysis
Technical Summary
CVE-2026-55639 is an out-of-bounds read vulnerability (CWE-125) in neutrinolabs xrdp affecting versions up to and including 0.10.6. The vulnerability occurs during the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create Request. Insufficient length validation allows a remote unauthenticated attacker to cause the xrdp process to read a small number of bytes beyond the declared data block boundary, potentially exposing process memory contents. This flaw is fixed in version 0.10.6.1.
Potential Impact
A remote unauthenticated attacker can exploit this vulnerability by sending a crafted RDP packet to cause an out-of-bounds read, potentially disclosing sensitive process memory contents. There is no impact on integrity or availability reported. The disclosed memory contents could potentially be combined with other vulnerabilities for further exploitation.
Mitigation Recommendations
Upgrade xrdp to version 0.10.6.1 or later where this vulnerability is fixed. No official patch or temporary fix is indicated other than upgrading. Patch status is confirmed fixed in 0.10.6.1.
CVE-2026-55639: CWE-125: Out-of-bounds Read in neutrinolabs xrdp
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.
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
CVE-2026-55639 is an out-of-bounds read vulnerability (CWE-125) in neutrinolabs xrdp affecting versions up to and including 0.10.6. The vulnerability occurs during the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create Request. Insufficient length validation allows a remote unauthenticated attacker to cause the xrdp process to read a small number of bytes beyond the declared data block boundary, potentially exposing process memory contents. This flaw is fixed in version 0.10.6.1.
Potential Impact
A remote unauthenticated attacker can exploit this vulnerability by sending a crafted RDP packet to cause an out-of-bounds read, potentially disclosing sensitive process memory contents. There is no impact on integrity or availability reported. The disclosed memory contents could potentially be combined with other vulnerabilities for further exploitation.
Mitigation Recommendations
Upgrade xrdp to version 0.10.6.1 or later where this vulnerability is fixed. No official patch or temporary fix is indicated other than upgrading. Patch status is confirmed fixed in 0.10.6.1.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T23:52:12.057Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a5e61922a4a8d59897a506f
Added to database: 07/20/2026, 17:57:38 UTC
Last enriched: 07/20/2026, 18:12:23 UTC
Last updated: 07/21/2026, 05:50:35 UTC
Views: 15
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