neutrinolabs xrdp up to 0.10.6 RFB protocol color map messages buffer overflow

Summaryinfo

A vulnerability classified as very critical was found in neutrinolabs xrdp up to 0.10.6. Impacted is an unknown function of the component RFB protocol color map messages. Such manipulation leads to buffer overflow. This vulnerability is referenced as CVE-2026-41252. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in neutrinolabs xrdp up to 0.10.6 and classified as very critical. Affected by this issue is an unknown function of the component RFB protocol color map messages. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

xrdp is an open source RDP server. Versions 0.10.6 and prior contain a missing bounds check in xrdp, which allows a heap-based buffer overflow when operating in vnc-any mode. The issue occurs during the handling of RFB protocol color map messages from a VNC server, where incoming color indices are not properly validated. A malicious VNC server can exploit this flaw by sending crafted messages with out-of-range values, leading to an out-of-bounds write on the heap. This memory corruption can result in a denial of service (DoS) or potentially allow remote code execution (RCE) prior to authentication. This issue has been fixed in version 0.10.6.1.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-41252 since 04/18/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/20/2026).

Upgrading to version 0.10.6.1 eliminates this vulnerability.

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Productinfo

Vendor

• neutrinolabs

Name

• xrdp

Version

• 0.10.0
• 0.10.1
• 0.10.2
• 0.10.3
• 0.10.4
• 0.10.5
• 0.10.6

Website

• Product: https://github.com/neutrinolabs/xrdp/

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