CVE-2026-114405 in vServer
Summary
by MITRE • 10/21/2026
Improper validation of array index vulnerability in Velneo vServer. This issue affects vServer: from 36.0 before 36.6 and from 37.0 before 37.2.
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Analysis
by VulDB Data Team • 10/21/2026
The identified security flaw represents a critical failure in input sanitization within the Velneo vServer application, specifically manifesting as an improper validation of array indices. This vulnerability arises when the server processes user-supplied data that is intended to be used as an index for accessing elements within an internal data structure or memory buffer. In secure software design, any external input utilized for indexing operations must undergo rigorous boundary checks to ensure it falls within the valid range defined by the lower and upper limits of the target array. The absence of these necessary validation steps in versions 36.0 through 36.5 and version 37.0 through 37.1 allows an attacker to supply arbitrary integer values that exceed or fall below the acceptable bounds, thereby bypassing standard safety mechanisms designed to prevent unauthorized memory access.
From a technical perspective, this flaw aligns with Common Weakness Enumeration identifier CWE-129, which describes Improper Validation of Array Index. When the application fails to verify that the provided index is within valid limits, it may lead to out-of-bounds read or write operations depending on how the subsequent code handles the invalid reference. An out-of-bounds read could result in the disclosure of sensitive internal data structures, potentially leaking memory contents that contain authentication tokens, session keys, or proprietary business logic. Conversely, an out-of-bounds write is significantly more dangerous as it can corrupt adjacent memory regions, leading to application crashes, denial of service conditions, or, in worst-case scenarios, arbitrary code execution if the attacker can control the data written and manipulate return addresses or function pointers within the process space.
The operational impact of this vulnerability is substantial given its potential for exploitation by remote attackers who interact with the vServer interface. Since Velneo vServer typically handles database queries and application logic over network connections, an unauthenticated or low-privileged attacker could craft specific HTTP requests or API calls containing maliciously crafted array indices to trigger these memory errors. Successful exploitation could lead to a complete compromise of the server's integrity and confidentiality. In enterprise environments where Velneo is deployed for critical business processes, such as financial transactions or customer data management, this vulnerability poses a severe risk to availability and data security. The ability to crash the service disrupts business continuity, while information leakage undermines trust and may violate regulatory compliance requirements regarding data protection.
This type of memory safety issue is frequently associated with exploitation techniques categorized under MITRE ATT&CK technique T1059, Command and Scripting Interpreter, if it leads to code execution, or more broadly within the initial access and privilege escalation phases depending on the specific outcome. Attackers often leverage such vulnerabilities during reconnaissance or as part of a broader exploit chain to gain footholds in protected networks. The lack of proper bounds checking is a classic example of how insufficient defensive coding practices can expose systems to remote exploitation without requiring complex reverse engineering efforts, making it an attractive target for automated scanning tools and opportunistic attackers alike.
To mitigate this vulnerability, immediate action must be taken by upgrading the Velneo vServer installation to version 36.6 or later, which includes patches addressing these specific array index validation failures. For organizations unable to upgrade immediately due to compatibility constraints, implementing a Web Application Firewall with rules capable of detecting anomalous integer values in request parameters can provide a temporary layer of defense. Additionally, developers should review the codebase for similar patterns where external inputs are used as indices and enforce strict range checking before any array access occurs. Adopting static application security testing tools that flag CWE-129 violations during the development lifecycle will help prevent recurrence of such flaws in future releases, ensuring a more robust defense against memory corruption attacks.