CVE-2026-61918 in Windows
Summary
by MITRE • 08/11/2026
Out-of-bounds read in Remote Desktop Client allows an unauthorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a critical out-of-bounds read flaw within the Remote Desktop Protocol client implementation that enables remote attackers to extract sensitive information from memory locations beyond the intended buffer boundaries. The technical nature of this issue stems from inadequate input validation and memory access controls within the rdpclient component, where insufficient bounds checking allows malicious data to trigger unauthorized memory reads. When a remote desktop client processes malformed or specially crafted network packets containing excessive data, the application fails to properly validate array indices or buffer limits before accessing memory regions, resulting in information disclosure through unintended memory traversal.
The operational impact of this vulnerability extends beyond simple information leakage as it can potentially expose sensitive credentials, session tokens, encryption keys, or system configuration details that reside in adjacent memory locations. Attackers can leverage this weakness by establishing a remote connection to a vulnerable client instance and sending specifically crafted RDP protocol messages that trigger the out-of-bounds read condition. This allows them to harvest valuable data from the application's memory space without requiring elevated privileges or authentication. The vulnerability aligns with CWE-125 which specifically addresses out-of-bounds read conditions in software implementations. From an adversary perspective, this flaw maps directly to ATT&CK technique T1046 for network service scanning and T1005 for data from local system, as attackers can use this weakness to gather intelligence about the target environment.
Security professionals should implement immediate mitigations including applying vendor security patches, enabling network segmentation between RDP clients and sensitive systems, and implementing intrusion detection systems to monitor for suspicious RDP traffic patterns. Additional protective measures involve configuring firewalls to restrict RDP access to trusted networks only, implementing strong authentication mechanisms such as multi-factor authentication, and conducting regular vulnerability assessments targeting remote desktop protocol implementations. Organizations should also consider deploying network monitoring solutions capable of detecting anomalous packet structures that could indicate exploitation attempts. The vulnerability demonstrates the importance of robust memory safety practices in network protocol implementations and highlights the critical need for comprehensive input validation across all user-facing components to prevent similar issues in future deployments.
This type of vulnerability represents a fundamental flaw in software security architecture where buffer management and bounds checking mechanisms fail to provide adequate protection against malicious input. The exploitation requires minimal privileges and can be automated through readily available network scanning tools, making it particularly dangerous for environments with exposed RDP services. The information disclosure potential increases significantly when combined with other reconnaissance activities, as attackers can use the leaked data to further compromise systems or identify additional attack vectors within the network infrastructure.