Threats Tagged 'cve-2026-55238'

A heap-based buffer overflow vulnerability exists in neutrinolabs xrdp versions 0.10.6 and prior when operating in vnc-any mode. The flaw arises from missing bounds checks on color map messages from a VNC server, allowing crafted out-of-range values to cause out-of-bounds heap writes. This can lead to denial of service or remote code execution before authentication. The issue is fixed in version 0.10.6.1.

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.