Bug 2459313 (CVE-2026-32623)

Summary: CVE-2026-32623 xrdp: xrdp NeutrinoRDP: Remote Code Execution or Denial of Service via heap-based buffer overflow in fragmented RDP data handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the NeutrinoRDP module of xrdp, an open-source Remote Desktop Protocol (RDP) server. This heap-based buffer overflow vulnerability occurs when the module fails to properly validate the size of reassembled fragmented virtual channel data against its allocated memory buffer. A malicious downstream RDP server or an attacker capable of performing a Man-in-the-Middle (MitM) attack could exploit this to cause memory corruption. This could potentially lead to a Denial of Service (DoS) or Remote Code Execution (RCE).
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Bug Depends On: 2459617, 2459618    
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Description OSIDB Bzimport 2026-04-17 21:01:50 UTC 
xrdp is an open source RDP server. Versions through 0.10.5 contain a heap-based buffer overflow vulnerability in the NeutrinoRDP module. When proxying RDP sessions from xrdp to another server, the module fails to properly validate the size of reassembled fragmented virtual channel data against its allocated memory buffer. A malicious downstream RDP server (or an attacker capable of performing a Man-in-the-Middle attack) could exploit this flaw to cause memory corruption, potentially leading to a Denial of Service (DoS) or Remote Code Execution (RCE). The NeutrinoRDP module is not built by default. This vulnerability only affects environments where the module has been explicitly compiled and enabled. Users can verify if the module is built by checking for --enable-neutrinordp in the output of the xrdp -v command. This issue has been fixed in version 0.10.6.