CVE-2026-83416 in Coherence
Summary
by MITRE • 09/16/2026
Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0 and 15.1.1.0.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Coherence. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Coherence. CVSS 3.1 Base Score 4.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L).
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Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability resides within the Core component of Oracle Coherence, a high-performance distributed caching and data grid product that is an integral part of the Oracle Fusion Middleware suite. This security flaw affects multiple supported versions of the software, specifically including releases 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, and 15.1.1.0.0. The presence of this vulnerability in these widely used enterprise versions indicates a systemic issue within the core processing logic that handles incoming network requests. Oracle Coherence is typically deployed in mission-critical environments to manage large-scale data distribution across distributed systems, making any instability or unavailability directly impactful on business continuity and service level agreements associated with those applications.
The technical nature of this flaw allows for exploitation by an attacker who possesses low privileges but has network access via the HTTP protocol. This classification suggests that the vulnerability is triggered through standard web-based interactions rather than requiring complex authentication bypasses or physical access to the host system. The attack vector leverages specific inputs sent over HTTP that are processed incorrectly by the Coherence engine, leading to resource exhaustion or state corruption within the application layer. Because the exploitation requires only low privileges and network connectivity, it significantly lowers the barrier for entry compared to high-privilege remote code execution vulnerabilities. This aligns with common attack patterns where adversaries exploit misconfigured access controls or insufficient input validation in web-facing services to disrupt operations without needing elevated system rights initially.
The operational impact of a successful exploitation is characterized as a partial denial of service, which corresponds to an availability impact on the CVSS 3.1 scoring model. A score of 4.3 indicates a medium severity level where the attacker can cause significant disruption but not necessarily a complete collapse of all services. In the context of Oracle Coherence, this could manifest as degraded performance, inability for specific nodes or clients to connect to the cluster, or intermittent failures in data retrieval and storage operations. For organizations relying on real-time analytics or transactional consistency provided by the data grid, such instability can lead to cascading failures in dependent applications that expect consistent availability from the cache layer. The partial nature of the denial suggests that while some functionality remains intact, the reliability and predictability of the system are severely compromised during an active attack.
From a threat intelligence perspective, this vulnerability maps closely to CWE-20 Improper Input Validation, as the root cause likely involves insufficient sanitization or validation of HTTP request parameters before they are processed by the core logic. Furthermore, it aligns with MITRE ATT&CK technique T1499 Endpoint Denial of Service, specifically under sub-techniques involving resource exhaustion through application layer attacks. Attackers often utilize such vulnerabilities in conjunction with other tactics to create noise or distract security teams while pursuing more critical objectives like data exfiltration. The ability to cause a denial of service via HTTP also highlights the importance of web application firewalls and rate limiting strategies, as these controls can mitigate the volume of malicious requests that trigger the underlying flaw before it causes significant system degradation.
Mitigation efforts should prioritize applying the latest security patches provided by Oracle for all affected versions listed in the advisory. Since the vulnerability is exploitable over HTTP with low privileges, organizations must also review their network segmentation and access control policies to ensure that only authorized services can communicate with Oracle Coherence instances on relevant ports. Implementing strict input validation at the application gateway level or using reverse proxies to filter suspicious traffic patterns can provide an additional layer of defense in depth. Regular vulnerability scanning and penetration testing focused on web-facing components are recommended to identify similar weaknesses before they can be leveraged by malicious actors. Maintaining up-to-date software configurations and monitoring for anomalous spikes in HTTP request volumes will help detect potential exploitation attempts early, thereby preserving the availability and integrity of the distributed data infrastructure.