EUVD-2026-35516
GHSA-q263-xmxv-64c3
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Remote Desktop Client occurs when a user connects to an attacker-controlled RDP server, allowing the server to corrupt heap memory and execute arbitrary code on the client endpoint. The flaw carries a CVSS 8.8 (High) rating reflecting network reach with required user interaction, and no public exploit is identified at time of analysis. The attack pivots the traditional RDP threat model - attackers compromise clients that initiate outbound connections rather than exposed servers.
Technical ContextAI
The vulnerability lives in Microsoft's Remote Desktop Client, the endpoint application implementing the Remote Desktop Protocol (RDP) for connecting to remote Windows hosts. The CWE-416 (Use After Free) classification, reinforced by the vendor's 'Heap-based buffer overflow' description and the Use After Free / Memory Corruption tags, indicates a memory safety defect where the client mishandles object lifetimes while parsing data returned from an RDP server. Freed heap objects are subsequently dereferenced, enabling an attacker controlling the server side of the RDP channel to corrupt adjacent heap structures and hijack control flow within the client process.
RemediationAI
Apply the Microsoft security update referenced in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47653 as soon as the patched build is identified for your platform - exact fix versions are not enumerated in the available data and must be pulled from MSRC. As a compensating control until patching completes, restrict outbound RDP (TCP/UDP 3389) from user workstations and admin jump hosts to only known-good internal RDP servers via host or perimeter firewall rules, which prevents users from connecting to attacker-controlled servers but breaks legitimate remote-to-external RDP use cases. Additionally, train administrators to avoid connecting to untrusted RDP endpoints and consider enforcing RDP connections only through gateways such as Remote Desktop Gateway with certificate validation.
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Same weakness CWE-416 – Use After Free
View allSame technique Buffer Overflow
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External POC / Exploit Code
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