AWS RES Remote Code Execution (CVE-2026-5707)

Overview

A high-severity command injection vulnerability, tracked as CVE-2026-5707, has been identified in AWS Research and Engineering Studio (RES). The flaw exists in versions 2025.03 through 2025.12.01 and stems from improper input sanitization when handling virtual desktop session names. This allows an authenticated attacker to execute arbitrary operating system commands with root-level privileges on the underlying virtual desktop host.

Technical Details and Impact

The vulnerability resides in the component that processes session names for virtual desktops within RES. Because user-supplied input for the session name is not properly sanitized before being used in an OS command, a remote attacker with valid credentials can craft a malicious session name containing system commands. When processed, these commands are executed with the highest level of privilege (root) on the host machine.

The impact is severe. Successful exploitation grants an attacker complete control over the affected virtual desktop host. From this position, they could deploy malware, exfiltrate sensitive research data, move laterally within the network, or establish a persistent backdoor. The CVSS score of 8.8 reflects the network-based attack vector, low attack complexity, and the requirement for only low-privilege authentication with no user interaction.

Remediation and Mitigation

AWS has released a patched version of Research and Engineering Studio. The primary and most effective remediation is to upgrade to RES version 2026.03 immediately. For organizations that cannot perform an immediate upgrade, AWS has provided a corresponding mitigation patch that should be applied to all affected versions (2025.03 to 2025.12.01) without delay.

Administrators should prioritize patching any internet-facing RES instances first, followed by internal deployments. As a temporary workaround while planning the update, restricting network access to RES management interfaces to only trusted, necessary IP ranges can reduce the attack surface.

Security Insight

This vulnerability highlights the persistent risk of command injection in cloud-managed services, where a flaw in a user-facing feature can directly compromise the underlying host’s security boundary. It echoes issues seen in other platforms, such as the recent critical flaws in Veeam Backup & Replication, where input validation failures led to remote code execution. The presence of such a basic injection flaw in a core function suggests a need for more rigorous secure coding practices and audit processes within the development lifecycle for cloud service providers.

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