CVE-2026-73796 in NonStop TSQLEXE
Summary
by MITRE • 10/14/2026
A security vulnerability in HPE NonStop TSQLEXE may cause application crash via a crafted SQL query.
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Analysis
by VulDB Data Team • 10/14/2026
The HPE NonStop TSQLEXE component, which serves as the core relational database management system for Hewlett Packard Enterprise's NonStop server environment, is susceptible to a critical stability issue triggered by malformed input. This vulnerability arises from insufficient validation and error handling mechanisms within the SQL query parser or execution engine when processing specifically crafted Structured Query Language statements. The flaw allows an attacker who can submit queries to the database service to induce a catastrophic failure in the TSQLEXE process, resulting in an application crash. In high-availability environments typical of NonStop systems, such crashes are particularly significant because they disrupt continuous operation and require manual or automated intervention to restore services, thereby impacting system availability and operational continuity.
From a technical perspective, this vulnerability is classified under CWE-20 Improper Input Validation, as the root cause lies in the failure to adequately sanitize or verify the structure of incoming SQL commands before execution. The crafted query likely exploits edge cases in parsing logic, such as buffer overflows, stack corruption, or unhandled exceptions within specific code paths that process complex or malformed syntax. When TSQLEXE encounters this invalid input, it fails to gracefully handle the error condition and instead terminates unexpectedly. This behavior indicates a lack of robust defensive programming practices regarding memory management and exception handling in legacy database components, which are often maintained for backward compatibility with older applications running on NonStop platforms.
The operational impact of this vulnerability is primarily centered around availability rather than confidentiality or integrity. An attacker who gains access to the TSQLEXE service interface can execute a denial-of-service attack by repeatedly sending these crafted queries, causing repeated crashes and forcing administrators to restart services frequently. This not only degrades performance but also poses risks during recovery processes where data consistency might be compromised if transactions are interrupted mid-execution. Furthermore, in environments where NonStop systems support critical financial or healthcare applications, such instability can lead to significant business disruption and potential regulatory non-compliance due to service unavailability.
Mitigation strategies should focus on both immediate remediation and long-term architectural improvements. The primary defense is the application of vendor-provided patches or updates that address the specific parsing flaws within TSQLEXE. Organizations must ensure their NonStop systems are running the latest supported versions with all security fixes applied. Additionally, network-level controls such as firewalls should be configured to restrict access to the database ports exclusively to authorized application servers and management stations, preventing unauthorized users from submitting crafted queries directly. Implementing strict input validation at the application layer is also crucial; developers writing SQL for NonStop applications must ensure that all user-supplied data is properly parameterized or escaped before being passed to TSQLEXE, thereby neutralizing potential injection vectors even if underlying parser vulnerabilities exist.
In terms of threat modeling and industry standards, this vulnerability aligns with MITRE ATT&CK techniques related to Denial of Service via service exhaustion or application crash exploitation. While it does not directly allow for code execution or data exfiltration in its current description, the instability introduced can be a precursor to more severe attacks if combined with other vulnerabilities. Security teams should monitor system logs for unexpected termination events associated with TSQLEXE and investigate any spikes in failed query attempts as potential indicators of exploitation activity. Regular vulnerability assessments focusing on database components are essential to identify such weaknesses before they can be leveraged by malicious actors targeting critical infrastructure running on NonStop platforms.