CVE-2026-76664 in NonStop EXPAND
Summary
by MITRE • 10/15/2026
A security vulnerability in HPE NonStop EXPAND may result in out-of-bounds memory read/write operations
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Analysis
by VulDB Data Team • 10/15/2026
The HPE NonStop EXPAND software contains a critical class of vulnerabilities related to improper boundary checking during data processing, which can lead to out-of-bounds memory access. This flaw typically manifests as either an out-of-bounds read or an out-of-bounds write operation within the application's memory space. In the context of systems programming and embedded environments like HPE NonStop, such errors are particularly severe because they bypass standard safety checks that are often enforced by higher-level languages but must be manually managed in lower-level implementations. The vulnerability arises when the software fails to validate input parameters or internal buffer indices against the allocated memory limits before performing read or write operations. This lack of validation allows an attacker who can influence the data flow within EXPAND to access memory locations that are outside the intended scope, potentially leading to information disclosure or arbitrary code execution depending on whether a read or write operation is exploited.
From a technical perspective, out-of-bounds reads allow for the leakage of sensitive internal state information, stack contents, or heap metadata that resides adjacent to the targeted buffer. This can facilitate further exploitation by revealing memory addresses needed for return-oriented programming attacks or bypassing security mechanisms like Address Space Layout Randomization. Conversely, out-of-bounds writes are even more dangerous as they permit an attacker to overwrite critical data structures, function pointers, or control flow variables within the process memory. Such overwrites can lead to a complete compromise of system integrity, allowing for privilege escalation if the vulnerable service runs with elevated permissions, which is common in enterprise infrastructure components like HPE NonStop EXPAND. The operational impact includes potential denial of service through application crashes caused by accessing invalid memory addresses, as well as severe confidentiality and integrity breaches where attackers can exfiltrate proprietary data or inject malicious commands into the system.
This vulnerability aligns with Common Weakness Enumeration (CWE) identifiers such as CWE-125 for out-of-bounds read and CWE-787 for out-of-bounds write, both of which are classified under broader categories like Improper Limitation of a Resource by an Actor or Memory Corruption vulnerabilities. In terms of the MITRE ATT&CK framework, exploitation of this flaw would likely fall under techniques related to Initial Access if it allows remote code execution via network interaction, and potentially Defense Evasion through memory manipulation to hide malicious activity. The presence of such flaws in infrastructure software highlights the risks associated with complex legacy systems that may not have undergone rigorous modern secure coding practices or automated static analysis for buffer boundary checks.
Mitigation strategies must prioritize immediate patching using vendor-provided updates that address these specific bounds-checking failures. Administrators should ensure that HPE NonStop EXPAND is updated to the latest version where memory access controls are strictly enforced. In addition to software updates, defense-in-depth measures such as enabling Data Execution Prevention and Address Space Layout Randomization can mitigate the impact of exploitation attempts by making it harder for attackers to predict memory layouts or execute injected code. Network segmentation should also be employed to restrict access to the vulnerable service from untrusted networks, reducing the attack surface available to potential adversaries attempting to trigger these out-of-bounds conditions through crafted inputs.