CVE-2026-79835 in Nonstop KMS Server
Summary
by MITRE • 10/15/2026
A crafted input message can cause a buffer overflow in HPE Nonstop KMS Server.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability identified involves a critical memory management flaw within the Key Management System (KMS) server component of the HPE Nonstop platform, specifically triggered by the processing of maliciously constructed input messages. This issue stems from improper bounds checking during the parsing and handling of incoming data streams, allowing an attacker to supply crafted inputs that exceed the allocated buffer limits. When the KMS server processes these oversized or malformed packets, it writes data beyond the boundaries of the intended memory space, resulting in a classic stack-based or heap-based buffer overflow condition. This type of flaw is fundamentally categorized under CWE-120 Buffer Copy without Checking Size of Input and often relates to CWE-787 Out-of-bounds Write depending on the specific implementation details of how the excess data overwrites adjacent memory structures such as return addresses, function pointers, or other critical control data within the application's execution context.
The operational impact of this vulnerability is severe due to the privileged nature of key management services in enterprise environments. The KMS server typically operates with elevated system privileges to manage cryptographic keys used for securing sensitive organizational data and communications. Successful exploitation allows a remote attacker who can interact with the network service hosting the KMS component to execute arbitrary code on the affected host machine. This could lead to complete compromise of the underlying operating system, enabling the attacker to install malware, create new administrative accounts, or pivot further into the internal network infrastructure. Furthermore, since cryptographic keys are central to data confidentiality and integrity, compromising the server where these keys reside may also facilitate decryption of previously captured encrypted traffic if session keys can be extracted from memory before they are rotated or revoked.
From a threat intelligence perspective, this vulnerability aligns with ATT&CK technique T1203 Exploitation for Client Execution, as attackers often leverage such software vulnerabilities to deploy payloads directly onto target systems without requiring user interaction beyond network connectivity. The attack vector is likely classified under Remote Code Execution via Network Service, emphasizing the need for strict input validation and secure coding practices in services exposed to untrusted networks. Organizations relying on HPE Nonstop infrastructure must recognize that even specialized or legacy platforms are susceptible to fundamental memory corruption vulnerabilities if software updates have not been applied to address known flaws in core components like KMS Server.
Mitigation strategies should prioritize the immediate application of vendor-provided patches and security updates released by Hewlett Packard Enterprise for the specific version of HPE Nonstop affected. In environments where patching is temporarily delayed, network segmentation becomes critical; administrators should restrict access to the KMS server ports using firewalls or Access Control Lists (ACLs) to allow connections only from authorized management stations and application servers that require key services. Additionally, implementing deep packet inspection solutions capable of detecting anomalous buffer sizes in incoming traffic can provide an additional layer of defense against exploitation attempts. Regular auditing of system logs for signs of memory corruption errors or unexpected service restarts is also recommended to detect potential probing activity early. Ensuring that the KMS server operates with the principle of least privilege, while not preventing a successful exploit due to the nature of buffer overflows often requiring escalation, helps limit the blast radius should an incident occur by restricting file system and process access rights associated with the service account.