CVE-2026-83088 in Database Server
Summary
by MITRE • 09/16/2026
Vulnerability in the RDBMS component of Oracle Database Server. Supported versions that are affected are 23.4.0-23.26.3. Easily exploitable vulnerability allows low privileged attacker having Authenticated User privilege with network access via Oracle Net to compromise RDBMS. While the vulnerability is in RDBMS, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of RDBMS. CVSS 3.1 Base Score 7.7 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H).
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Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability resides within the Relational Database Management System component of Oracle Database Server, specifically affecting supported versions ranging from 23.4.0 to 23.26.3. This flaw represents a significant security risk due to its potential for remote exploitation by attackers with relatively low privilege levels. The attack vector is network-based, requiring the adversary to have authenticated user privileges and access via Oracle Net services. While the technical root cause is located within the RDBMS layer, the operational impact extends beyond this component alone. Successful exploitation can lead to a scope change where additional products or integrated systems are significantly impacted, indicating that the vulnerability may trigger cascading failures across the broader database infrastructure rather than isolating the damage strictly to the core engine processes.
From a technical perspective, the primary consequence of exploiting this flaw is a denial of service condition. The vulnerability allows an authenticated attacker to cause the RDBMS process to hang or experience frequent, repeatable crashes. This results in a complete loss of availability for database services, which can disrupt critical business operations that rely on continuous data access and transaction processing. The severity of this impact is quantified by a CVSS 3.1 Base Score of 7.7, classified as High Severity with a primary focus on Availability impacts. The specific vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H) confirms that the attack requires network access and low privileges but offers high availability impact while maintaining no direct compromise to confidentiality or integrity in this specific manifestation, although the scope change suggests potential secondary effects on other system components.
In terms of industry standard classification, this vulnerability aligns with CWE-400: Uncontrolled Resource Consumption, as it leads to resource exhaustion causing a hang or crash. It also relates to CWE-617: Reachable Assertion if the crash is triggered by failing internal checks during processing. From an offensive security framework perspective, such behavior maps to MITRE ATT&CK technique T1499: Endpoint Denial of Service, specifically under sub-techniques involving resource exhaustion or service disruption. The requirement for authentication places this within the context of lateral movement or privilege escalation scenarios where an attacker has already gained initial access through weaker credentials and seeks to disrupt operations rather than steal data immediately.
Mitigation strategies must prioritize immediate patching to address the underlying code flaw in the RDBMS component. Organizations should apply the latest Oracle Critical Patch Update (CPU) that includes fixes for this specific vulnerability, ensuring all instances within the 23.4.0 through 23.26.3 version range are updated. In addition to software updates, network segmentation and strict access control lists should be enforced on Oracle Net ports to limit exposure to only authorized administrative networks. Implementing robust authentication mechanisms and monitoring for unusual patterns of database connections or resource usage can help detect attempted exploitation early. Regular vulnerability scanning focused on RDBMS components is essential to maintain visibility into such risks within the enterprise environment.