CVE-2026-73746 in Fabric Composer
Summary
by MITRE • 09/01/2026
A denial-of-service vulnerability exists in the API of HPE Networking Fabric Composer that could allow an authenticated low privilege operator user to cause a denial of service. Successful exploitation could allow an attacker to interrupt the normal operation of the affected service.
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Analysis
by VulDB Data Team • 09/02/2026
The identified vulnerability resides within the application programming interface of Hewlett Packard Enterprise Networking Fabric Composer, presenting a significant risk to system availability through a denial-of-service mechanism. This flaw is particularly concerning because it can be exploited by an authenticated user holding low-privilege operator credentials. The existence of this attack vector indicates that the software fails to adequately validate or rate-limit requests originating from users with minimal access rights, allowing them to trigger conditions that disrupt service continuity without requiring administrative privileges.
From a technical perspective, the vulnerability stems from insufficient input validation and resource management controls within the API endpoints managed by Fabric Composer. When an operator user submits specific malformed or excessively demanding requests, the application fails to handle these inputs gracefully, leading to resource exhaustion such as memory leaks, thread blocking, or CPU spikes that render the service unresponsive. This behavior aligns with common software design flaws where edge cases are not properly accounted for in request processing logic, resulting in a state of instability that prevents legitimate users from accessing network management functions.
The operational impact of this vulnerability is severe due to its potential to interrupt normal operations within an enterprise networking environment. Fabric Composer serves as a centralized controller for managing virtual and physical networks; therefore, any disruption to its availability directly impacts the ability of administrators to monitor, configure, and troubleshoot network infrastructure. An attacker leveraging this flaw could effectively blindside security teams by disabling visibility into network traffic flows or preventing critical configuration changes during active incidents, thereby degrading overall organizational resilience and operational efficiency.
In terms of industry classification standards, this vulnerability is categorized under CWE-400, which denotes uncontrolled resource consumption leading to denial of service conditions. Furthermore, the exploitation technique corresponds to MITRE ATT&CK tactic T1499, specifically Endpoint Denial of Service, as it involves actions taken by an adversary that result in disruption or destruction of availability for a specific target system component. The requirement for authentication places this within the context of insider threats or compromised low-level accounts rather than external unauthenticated attacks.
To mitigate this risk, organizations should implement strict rate limiting and request validation policies on all API endpoints exposed by Fabric Composer to prevent resource exhaustion from any single user session. It is also critical to apply vendor-provided patches that address these specific input handling flaws as soon as they become available. Additionally, deploying network segmentation strategies can limit the blast radius of such an attack by restricting which users or systems have direct access to the management interface, thereby reducing the likelihood of successful exploitation even if low-privilege credentials are compromised.